W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com natty Release:

sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com 40976EAF437D05B5
sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com 94E58C34A8670E8C

You should also remove duplicates in your sources.list file (or remove the duplicated repo in software centre)

Thankyou, did as you said but still comming up with the same result

On Fri, Jul 15, 2011 at 10:25 AM, actionparsnip <
<email address hidden>> wrote:

> Your question #164828 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/164828
>
> Status: Open => Answered
>
> actionparsnip proposed the following answer:
> sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com40976EAF437D05B5
> sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com94E58C34A8670E8C
>
> You should also remove duplicates in your sources.list file (or remove
> the duplicated repo in software centre)
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
> https://answers.launchpad.net/ubuntu/+question/164828/+confirm?answer_id=0
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+question/164828
>
> You received this question notification because you asked the question.
>

In software centre check there are no duplicates in the 'other sources' tab

You may also want to run:

gksudo gedit /etc/apt/sources.list

and ensure each line is unique

tried found 2 of this # deb
http://deb.torproject.org/torproject.orgexperimental-lucid main i
deleted that copy but still does the same

On Fri, Jul 15, 2011 at 11:31 AM, actionparsnip <
<email address hidden>> wrote:

> Your question #164828 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/164828
>
> Status: Open => Answered
>
> actionparsnip proposed the following answer:
> In software centre check there are no duplicates in the 'other sources'
> tab
>
> You may also want to run:
>
> gksudo gedit /etc/apt/sources.list
>
> and ensure each line is unique
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
> https://answers.launchpad.net/ubuntu/+question/164828/+confirm?answer_id=2
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+question/164828
>
> You received this question notification because you asked the question.
>

You are using Natty, so Lucid repos are of no value to you. You should delete all the Lucid repos

changed both lucids to natty still the same noticed this is it normal
deb http://nz.archive.ubuntu.com/ubuntu/ natty main universe multiverse restricted
deb-src http://nz.archive.ubuntu.com/ubuntu/ natty main universe multiverse restricted
deb http://nz.archive.ubuntu.com/ubuntu/ natty-updates main universe multiverse restricted
deb-src http://nz.archive.ubuntu.com/ubuntu/ natty-updates main universe multiverse restricted
deb http://archive.canonical.com/ubuntu natty partner
deb-src http://archive.canonical.com/ubuntu natty partner
deb http://nz.archive.ubuntu.com/ubuntu/ natty-security main universe multiverse restricted
deb-src http://nz.archive.ubuntu.com/ubuntu/ natty-security main universe multiverse restricted
# deb http://mirrors.ucr.ac.cr/medibuntu/ maverick free non-free # disabled on upgrade to maverick
# deb-src http://mirrors.ucr.ac.cr/medibuntu/ maverick free non-free # disabled on upgrade to maverick
# deb http://archive.getdeb.net/ubuntu natty-getdeb apps
# deb http://deb.torproject.org/torproject.org experimental-natty main
deb http://nz.archive.ubuntu.com/ubuntu/ natty-proposed universe main multiverse restricted
deb-src http://nz.archive.ubuntu.com/ubuntu/ natty-proposed universe main multiverse restricte

are these correct
# deb http://mirrors.ucr.ac.cr/medibuntu/ maverick free non-free # disabled on upgrade to maverick
# deb-src http://mirrors.ucr.ac.cr/medibuntu/ maverick free non-free # disabled on upgrade to maverick

deb http://nz.archive.ubuntu.com/ubuntu/ natty main universe multiverse restricted
deb-src http://nz.archive.ubuntu.com/ubuntu/ natty main universe multiverse restricted
deb http://nz.archive.ubuntu.com/ubuntu/ natty-updates main universe multiverse restricted
deb-src http://nz.archive.ubuntu.com/ubuntu/ natty-updates main universe multiverse restricted
deb http://archive.canonical.com/ubuntu natty partner
deb-src http://archive.canonical.com/ubuntu natty partner
deb http://nz.archive.ubuntu.com/ubuntu/ natty-security main universe multiverse restricted
deb-src http://nz.archive.ubuntu.com/ubuntu/ natty-security main universe multiverse restricted
# deb http://mirrors.ucr.ac.cr/medibuntu/ maverick free non-free # disabled on upgrade to maverick
# deb-src http://mirrors.ucr.ac.cr/medibuntu/ maverick free non-free # disabled on upgrade to maverick
# deb http://archive.getdeb.net/ubuntu natty-getdeb apps
# deb http://deb.torproject.org/torproject.org experimental-natty main
deb http://nz.archive.ubuntu.com/ubuntu/ natty-proposed universe main multiverse restricted
deb-src http://nz.archive.ubuntu.com/ubuntu/ natty-proposed universe main multiverse restricte

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com natty Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>

W: GPG error: http://ppa.launchpad.net natty Release: The following signatures were invalid: BADSIG 94E58C34A8670E8C Launchpad PPA for Screenlets
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/natty/Release

W: Some index files failed to download. They have been ignored, or old ones used instead.
W: Duplicate sources.list entry http://archive.canonical.com/ubuntu/ natty/partner i386 Packages (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_natty_partner_binary-i386_Packages)

If you are running a natty system, you should only have natty lines in your sources.list.
So you could delete the 'maverick' lines, or replace maverick by natty.

Try again, open a terminal and issue the following commands:

sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com 40976EAF437D05B5
sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com 94E58C34A8670E8C
cat /etc/apt/sources.list
sudo apt-get update

And then copy all output and paste it into the Message: input box of https://answers.launchpad.net/ubuntu/+source/apt/+question/164828

W: GPG error: http://ppa.launchpad.net natty Release: The following signatures were invalid: BADSIG 94E58C34A8670E8C Launchpad PPA for Screenlets
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com natty Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>

W: Failed to fetch http://archive.canonical.com/ubuntu/dists/natty/Release

W: Some index files failed to download. They have been ignored, or old ones used instead.

The "W: GPG ... BADSIG ..." messages should disappear after executing these two commands:

sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com 40976EAF437D05B5
sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com 94E58C34A8670E8C

Executing: gpg --ignore-time-conflict --no-options --no-default-keyring
--secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg
--keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg
--recv-key --keyserver keyserver.ubuntu.com 40976EAF437D05B5
gpg: requesting key 437D05B5 from hkp server keyserver.ubuntu.com
gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key <
<email address hidden>>" not changed
gpg: Total number processed: 1
gpg: unchanged: 1
rob@rob-desktop:~$ sudo apt-key adv --recv-key --keyserver
keyserver.ubuntu.com 94E58C34A8670E8C
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring
--secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg
--keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg
--recv-key --keyserver keyserver.ubuntu.com 94E58C34A8670E8C
gpg: requesting key A8670E8C from hkp server keyserver.ubuntu.com
gpg: key A8670E8C: "Launchpad PPA for Screenlets" not changed
gpg: Total number processed: 1
gpg: unchanged: 1

Executing: gpg --ignore-time-conflict --no-options --no-default-keyring
--secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg
--keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg
--recv-key --keyserver keyserver.ubuntu.com 40976EAF437D05B5
gpg: requesting key 437D05B5 from hkp server keyserver.ubuntu.com
gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key <
<email address hidden>>" not changed
gpg: Total number processed: 1
gpg: unchanged: 1
rob@rob-desktop:~$ sudo apt-key adv --recv-key --keyserver
keyserver.ubuntu.com 94E58C34A8670E8C
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring
--secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg
--keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg
--recv-key --keyserver keyserver.ubuntu.com 94E58C34A8670E8C
gpg: requesting key A8670E8C from hkp server keyserver.ubuntu.com
gpg: key A8670E8C: "Launchpad PPA for Screenlets" not changed
gpg: Total number processed: 1
gpg: unchanged: 1

On Tue, Jul 19, 2011 at 5:46 PM, Manfred Hampl <
<email address hidden>> wrote:

> Your question #164828 on apt in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/apt/+question/164828
>
> Status: Open => Answered
>
> Manfred Hampl proposed the following answer:
> The "W: GPG ... BADSIG ..." messages should disappear after executing
> these two commands:
>
> sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com40976EAF437D05B5
> sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com94E58C34A8670E8C
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
>
> https://answers.launchpad.net/ubuntu/+source/apt/+question/164828/+confirm?answer_id=11
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+source/apt/+question/164828
>
> You received this question notification because you asked the question.
>

If the two apt-key commands do not help try the following:

Open a terminal (ctrl-alt-t) end execute these commands:

sudo rm -rf /var/lib/apt/lists
sudo mkdir /var/lib/apt/lists
sudo mkdir /var/lib/apt/lists/partial
sudo apt-get update

and try the update/upgrade process again.

If the update process still does not work as it should, please follow the instructions in https://help.ubuntu.com/community/PackageManagerTroubleshootingProcedure with the only exception that in step 5 you should not create a new question document, but continue in this current one https://answers.launchpad.net/ubuntu/+source/apt/+question/164828

thankz almost solved except for this following output
W: Duplicate sources.list entry
http://archive.canonical.com/ubuntu/natty/partner i386 Packages
(/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_natty_partner_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems

On Tue, Jul 19, 2011 at 9:31 PM, Manfred Hampl <
<email address hidden>> wrote:

> Your question #164828 on apt in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/apt/+question/164828
>
> Status: Open => Answered
>
> Manfred Hampl proposed the following answer:
> If the two apt-key commands do not help try the following:
>
> Open a terminal (ctrl-alt-t) end execute these commands:
>
> sudo rm -rf /var/lib/apt/lists
> sudo mkdir /var/lib/apt/lists
> sudo mkdir /var/lib/apt/lists/partial
> sudo apt-get update
>
> and try the update/upgrade process again.
>
> If the update process still does not work as it should, please follow
> the instructions in
> https://help.ubuntu.com/community/PackageManagerTroubleshootingProcedure
> with the only exception that in step 5 you should not create a new
> question document, but continue in this current one
> https://answers.launchpad.net/ubuntu/+source/apt/+question/164828
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
>
> https://answers.launchpad.net/ubuntu/+source/apt/+question/164828/+confirm?answer_id=13
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+source/apt/+question/164828
>
> You received this question notification because you asked the question.
>

For the warning message "W: Duplicate sources.list entry...":
You seem to have a double entry somewhere in your sources.list
To identify that please issue the following commands and copy/paste the output as done before:

cat /etc/apt/sources.list
ls -l /etc/apt/sources.list.d

thanks matey it seems to have worked.

Those two commands do not actually *change* anything (they merely provide detailed information), so unless you separately edited your software sources to remove the duplicate, it is very strange that the warning message has gone away.

Sorry, I neglected to see that it was actionparsnip's commands (which certainly do have the ability to fix things, when run) that you had marked as solving your problem. You can ignore my last post (#19).

kia ora eliah thanks anyway

On Wed, Jul 20, 2011 at 6:46 PM, Eliah Kagan <
<email address hidden>> wrote:

> Your question #164828 on apt in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/apt/+question/164828
>
> Eliah Kagan posted a new comment:
> Sorry, I neglected to see that it was actionparsnip's commands (which
> certainly do have the ability to fix things, when run) that you had
> marked as solving your problem. You can ignore my last post (#19).
>
> --
> You received this question notification because you asked the question.
>

mansur@mansur-laptop:~$ sudo fuser -vvv /var/lib/dpkg/lock
[sudo] password for mansur:
mansur@mansur-laptop:~$ uname -a
Linux mansur-laptop 2.6.32-33-generic #70-Ubuntu SMP Thu Jul 7 21:09:46 UTC 2011 i686 GNU/Linux
mansur@mansur-laptop:~$ sudo rm /var/lib/apt/lists/lock
mansur@mansur-laptop:~$ sudo cp -arf /var/lib/dpkg /var/lib/dpkg.backup
mansur@mansur-laptop:~$ sudo cp /var/lib/dpkg/status-old /var/lib/dpkg/status
mansur@mansur-laptop:~$ sudo cp /var/lib/dpkg/available-old /var/lib/dpkg/available
mansur@mansur-laptop:~$ sudo rm -rf /var/lib/dpkg/updates/*
mansur@mansur-laptop:~$ sudo rm -rf /var/lib/apt/lists
mansur@mansur-laptop:~$ sudo rm /var/cache/apt/*.bin
mansur@mansur-laptop:~$ sudo mkdir /var/lib/apt/lists
mansur@mansur-laptop:~$ sudo mkdir /var/lib/apt/lists/partial
mansur@mansur-laptop:~$ LANG=C;sudo apt-get clean
mansur@mansur-laptop:~$ LANG=C;sudo apt-get autoclean
Reading package lists... Done
Building dependency tree
Reading state information... Done
mansur@mansur-laptop:~$ LANG=C;sudo apt-get --purge autoremove
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
8 not fully installed or removed.
After this operation, 0B of additional disk space will be used.
Setting up apt-utils (0.7.25.3ubuntu9.6) ...

Setting up openssh-client (1:5.3p1-3ubuntu7) ...

Setting up python-apt (0.7.94.2ubuntu6.4) ...

Setting up apt-transport-https (0.7.25.3ubuntu9.6) ...
Setting up libimobiledevice0 (0.9.7-1ubuntu1.1) ...

Setting up libparted0debian1 (2.2-5ubuntu5.2) ...

Setting up parted (2.2-5ubuntu5.2) ...
Setting up ssh-askpass-gnome (1:5.3p1-3ubuntu7) ...

Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Processing triggers for python-central ...
mansur@mansur-laptop:~$ LANG=C;sudo apt-get update -o APT::Cache-Limit=25165824
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid Release.gpg
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid Release
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
Err cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Err cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Get:1 http://archive.ubuntu.com lucid Release.gpg [189B]
Get:2 http://archive.ubuntu.com lucid-updates Release.gpg [198B]
Get:3 http://security.ubuntu.com lucid-security Release.gpg [198B]
Get:4 http://archive.ubuntu.com lucid Release [57.2kB]
Get:5 http://security.ubuntu.com lucid-security Release [44.7kB]
Get:6 http://security.ubuntu.com lucid-security/restricted Packages [14B]
Get:7 http://archive.ubuntu.com lucid-updates Release [44.7kB]
Get:8 http://security.ubuntu.com lucid-security/main Packages [199kB]
Ign http://archive.ubuntu.com lucid-updates Release
Get:9 http://archive.ubuntu.com lucid/main Packages [1386kB]
Get:10 http://archive.canonical.com lucid Release.gpg [198B]
Get:11 http://security.ubuntu.com lucid-security/multiverse Packages [4563B]
Get:12 http://security.ubuntu.com lucid-security/universe Packages [78.9kB]
Get:13 http://archive.canonical.com lucid Release [8215B]
Get:14 http://archive.canonical.com lucid/partner Packages [13.8kB]
Get:15 http://archive.ubuntu.com lucid/restricted Packages [6208B]
Get:16 http://archive.ubuntu.com lucid/main Sources [659kB]
Get:17 http://archive.ubuntu.com lucid/restricted Sources [3775B]
Get:18 http://archive.ubuntu.com lucid/universe Packages [5448kB]
Get:19 http://archive.ubuntu.com lucid/universe Sources [3165kB]
Get:20 http://archive.ubuntu.com lucid/multiverse Packages [180kB]
Get:21 http://archive.ubuntu.com lucid/multiverse Sources [119kB]
Get:22 http://archive.ubuntu.com lucid-updates/restricted Packages [3240B]
Get:23 http://archive.ubuntu.com lucid-updates/main Packages [510kB]
Get:24 http://archive.ubuntu.com lucid-updates/multiverse Packages [10.5kB]
Get:25 http://archive.ubuntu.com lucid-updates/universe Packages [220kB]
Fetched 12.2MB in 1min 3s (191kB/s)
W: GPG error: http://archive.ubuntu.com lucid-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>
W: Failed to fetch cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3)/dists/lucid/main/binary-i386/Packages.gz Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

W: Failed to fetch cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3)/dists/lucid/restricted/binary-i386/Packages.gz Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

E: Some index files failed to download, they have been ignored, or old ones used instead.
mansur@mansur-laptop:~$ sudo dpkg --clear-avail
mansur@mansur-laptop:~$ sudo dpkg --configure -a
mansur@mansur-laptop:~$ LANG=C;sudo apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
mansur@mansur-laptop:~$ LANG=C;sudo apt-get --fix-missing install
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
mansur@mansur-laptop:~$ LANG=C;sudo apt-get update -o APT::Cache-Limit=25165824 && sudo apt-get dist-upgrade
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid Release.gpg
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid Release
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
Err cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Err cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Hit http://archive.canonical.com lucid Release.gpg
Hit http://security.ubuntu.com lucid-security Release.gpg
Hit http://archive.canonical.com lucid Release
Hit http://archive.canonical.com lucid/partner Packages
Hit http://security.ubuntu.com lucid-security Release
Get:1 http://security.ubuntu.com lucid-security/restricted Packages [14B]
Hit http://archive.ubuntu.com lucid Release.gpg
Get:2 http://archive.ubuntu.com lucid-updates Release.gpg [198B]
Hit http://security.ubuntu.com lucid-security/main Packages
Hit http://security.ubuntu.com lucid-security/multiverse Packages
Hit http://archive.ubuntu.com lucid Release
Hit http://security.ubuntu.com lucid-security/universe Packages
Get:3 http://archive.ubuntu.com lucid-updates Release [44.7kB]
Hit http://archive.ubuntu.com lucid/main Packages
Hit http://archive.ubuntu.com lucid/restricted Packages
Hit http://archive.ubuntu.com lucid/main Sources
Hit http://archive.ubuntu.com lucid/restricted Sources
Hit http://archive.ubuntu.com lucid/universe Packages
Hit http://archive.ubuntu.com lucid/universe Sources
Hit http://archive.ubuntu.com lucid/multiverse Packages
Hit http://archive.ubuntu.com lucid/multiverse Sources
Hit http://archive.ubuntu.com lucid-updates/restricted Packages
Get:4 http://archive.ubuntu.com lucid-updates/main Packages [510kB]
Hit http://archive.ubuntu.com lucid-updates/multiverse Packages
Get:5 http://archive.ubuntu.com lucid-updates/universe Packages [220kB]
Fetched 730kB in 17s (41.3kB/s)
W: Failed to fetch cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3)/dists/lucid/main/binary-i386/Packages.gz Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

W: Failed to fetch cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3)/dists/lucid/restricted/binary-i386/Packages.gz Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

E: Some index files failed to download, they have been ignored, or old ones used instead.
mansur@mansur-laptop:~$ LANG=C;sudo apt-get update -o APT::Cache-Limit=25165824 && sudo apt-get dist-upgrade
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid Release.gpg
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid Release
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
Err cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Err cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Hit http://archive.canonical.com lucid Release.gpg
Hit http://archive.canonical.com lucid Release
Hit http://security.ubuntu.com lucid-security Release.gpg
Hit http://security.ubuntu.com lucid-security Release
Hit http://archive.canonical.com lucid/partner Packages
Hit http://security.ubuntu.com lucid-security/restricted Packages
Hit http://security.ubuntu.com lucid-security/main Packages
Hit http://security.ubuntu.com lucid-security/multiverse Packages
Hit http://security.ubuntu.com lucid-security/universe Packages
Hit http://archive.ubuntu.com lucid Release.gpg
Hit http://archive.ubuntu.com lucid-updates Release.gpg
Hit http://archive.ubuntu.com lucid Release
Hit http://archive.ubuntu.com lucid-updates Release
Hit http://archive.ubuntu.com lucid/main Packages
Hit http://archive.ubuntu.com lucid/restricted Packages
Hit http://archive.ubuntu.com lucid/main Sources
Hit http://archive.ubuntu.com lucid/restricted Sources
Hit http://archive.ubuntu.com lucid/universe Packages
Hit http://archive.ubuntu.com lucid/universe Sources
Hit http://archive.ubuntu.com lucid/multiverse Packages
Hit http://archive.ubuntu.com lucid/multiverse Sources
Hit http://archive.ubuntu.com lucid-updates/restricted Packages
Hit http://archive.ubuntu.com lucid-updates/main Packages
Hit http://archive.ubuntu.com lucid-updates/multiverse Packages
Hit http://archive.ubuntu.com lucid-updates/universe Packages
W: Failed to fetch cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3)/dists/lucid/main/binary-i386/Packages.gz Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

W: Failed to fetch cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3)/dists/lucid/restricted/binary-i386/Packages.gz Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

E: Some index files failed to download, they have been ignored, or old ones used instead.
mansur@mansur-laptop:~$ LANG=C;sudo apt-get update -o APT::Cache-Limit=25165824 && sudo apt-get dist-upgrade
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid Release.gpg
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid Release
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
Ign cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
Err cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/main Packages
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Err cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3) lucid/restricted Packages
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Hit http://security.ubuntu.com lucid-security Release.gpg
Hit http://archive.canonical.com lucid Release.gpg
Hit http://archive.ubuntu.com lucid Release.gpg
Hit http://archive.ubuntu.com lucid-updates Release.gpg
Hit http://archive.canonical.com lucid Release
Hit http://archive.canonical.com lucid/partner Packages
Hit http://security.ubuntu.com lucid-security Release
Hit http://archive.ubuntu.com lucid Release
Hit http://security.ubuntu.com lucid-security/restricted Packages
Hit http://archive.ubuntu.com lucid-updates Release
Hit http://archive.ubuntu.com lucid/main Packages
Hit http://archive.ubuntu.com lucid/restricted Packages
Hit http://security.ubuntu.com lucid-security/main Packages
Get:1 http://security.ubuntu.com lucid-security/multiverse Packages [4563B]
Hit http://archive.ubuntu.com lucid/main Sources
Hit http://archive.ubuntu.com lucid/restricted Sources
Hit http://security.ubuntu.com lucid-security/universe Packages
Hit http://archive.ubuntu.com lucid/universe Packages
Hit http://archive.ubuntu.com lucid/universe Sources
Hit http://archive.ubuntu.com lucid/multiverse Packages
Hit http://archive.ubuntu.com lucid/multiverse Sources
Hit http://archive.ubuntu.com lucid-updates/restricted Packages
Hit http://archive.ubuntu.com lucid-updates/main Packages
Hit http://archive.ubuntu.com lucid-updates/multiverse Packages
Hit http://archive.ubuntu.com lucid-updates/universe Packages
Fetched 4563B in 5s (775B/s)
W: Failed to fetch cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3)/dists/lucid/main/binary-i386/Packages.gz Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

W: Failed to fetch cdrom://Ubuntu 10.04.2 LTS _Lucid Lynx_ - Release i386 (20110211.3)/dists/lucid/restricted/binary-i386/Packages.gz Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

E: Some index files failed to download, they have been ignored, or old ones used instead.
mansur@mansur-laptop:~$ sudo apt-cdrom
apt 0.7.25.3ubuntu9.6 for i386 compiled on Jul 13 2011 11:09:55
Usage: apt-cdrom [options] command

apt-cdrom is a tool to add CDROM's to APT's source list. The
CDROM mount point and device information is taken from apt.conf
and /etc/fstab.

Commands:
   add - Add a CDROM
   ident - Report the identity of a CDROM

Options:
  -h This help text
  -d CD-ROM mount point
  -r Rename a recognized CD-ROM
  -m No mounting
  -f Fast mode, don't check package files
  -a Thorough scan mode
  --auto-detect Auto detect drive and mount point
  -c=? Read this configuration file
  -o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp
See fstab(5)
mansur@mansur-laptop:~$ LANG=C;sudo apt-get --fix-missing installReading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
mansur@mansur-laptop:~$

sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com 40976EAF437D05B5

@mansur:
You should have created your own question, and not piggyback on an other person's question that has already been marked as solved and whose details are about a completely differebt release of Ubuntu.

There is one minor error in your sources list: you have still the CD from your installation listed as source, and this creates warning messages when you do not have the CD loaded in your CD drive and start a package management program.

To eliminate that, you should proceed as follows:
Open update-manager, click on 'settings' and disable (unmark) all references to a CD on the first AND second tabs.
Then try again with the command

sudo apt-get update

If you need more help create y question of your own with https://answers.launchpad.net/ubuntu/+source/apt/+addquestion