dont understand what the error is or means

Try switching to the main update server, as described in step 1 at https://help.ubuntu.com/community/PackageManagerTroubleshootingProcedure. Or use the procedure at http://linax.wordpress.com/2009/07/14/apt-get-complain-the-following-signatures-couldnt-be-verified-because-the-public-key-is-not-available/ to try to import the key.

If neither of those techniques works, please post again.

this is what i got

seb@TelAttract:~$ sudo fuser -vvv /var/lib/dpkg/lock
[sudo] password for seb:
seb@TelAttract:~$ sudo fuser -vvv /var/lib/dpkg/lock
seb@TelAttract:~$
seb@TelAttract:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.04
DISTRIB_CODENAME=lucid
DISTRIB_DESCRIPTION="Ubuntu 10.04.2 LTS"
seb@TelAttract:~$
seb@TelAttract:~$ uname -a
Linux TelAttract 2.6.32-29-generic #58-Ubuntu SMP Fri Feb 11 19:00:09 UTC 2011 i686 GNU/Linux
seb@TelAttract:~$
seb@TelAttract:~$ sudo rm /var/lib/apt/lists/lock
seb@TelAttract:~$
seb@TelAttract:~$ sudo cp -arf /var/lib/dpkg /var/lib/dpkg.backup
seb@TelAttract:~$
seb@TelAttract:~$ sudo cp /var/lib/dpkg/status-old /var/lib/dpkg/status
seb@TelAttract:~$
seb@TelAttract:~$ sudo cp /var/lib/dpkg/available-old /var/lib/dpkg/available
seb@TelAttract:~$
seb@TelAttract:~$ sudo rm -rf /var/lib/dpkg/updates/*
seb@TelAttract:~$
seb@TelAttract:~$ sudo rm -rf /var/lib/apt/lists
seb@TelAttract:~$
seb@TelAttract:~$ sudo rm /var/cache/apt/*.bin
seb@TelAttract:~$
seb@TelAttract:~$ sudo mkdir /var/lib/apt/lists
seb@TelAttract:~$
seb@TelAttract:~$ sudo mkdir /var/lib/apt/lists/partial
seb@TelAttract:~$
seb@TelAttract:~$ LANG=C;sudo apt-get clean
seb@TelAttract:~$
seb@TelAttract:~$ LANG=C;sudo apt-get autoclean
Reading package lists... Done
Building dependency tree
Reading state information... Done
seb@TelAttract:~$
seb@TelAttract:~$ 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.
seb@TelAttract:~$
seb@TelAttract:~$ LANG=C;sudo apt-get update -o APT::Cache-Limit=25165824
Get:1 http://archive.ubuntu.com lucid Release.gpg [189B]
Get:2 http://archive.ubuntu.com lucid-updates Release.gpg [198B]
Get:3 http://archive.ubuntu.com lucid-security Release.gpg [198B]
Get:4 http://ppa.launchpad.net lucid Release.gpg [316B]
Get:5 http://archive.ubuntu.com lucid Release [57.2kB]
Get:6 http://ppa.launchpad.net lucid Release [14.0kB]
Ign http://ppa.launchpad.net lucid Release
Get:7 http://ppa.launchpad.net lucid/main Packages [9532B]
Get:8 http://archive.ubuntu.com lucid-updates Release [44.7kB]
Get:9 http://ppa.launchpad.net lucid/main Sources [2633B]
Get:10 http://archive.ubuntu.com lucid-security Release [44.7kB]
Get:11 http://archive.ubuntu.com lucid/main Packages [1386kB]
Get:12 http://archive.ubuntu.com lucid/restricted Packages [6208B]
Get:13 http://archive.ubuntu.com lucid/main Sources [659kB]
Get:14 http://archive.ubuntu.com lucid/restricted Sources [3775B]
Get:15 http://archive.ubuntu.com lucid/universe Packages [5448kB]
Get:16 http://archive.ubuntu.com lucid/universe Sources [3165kB]
Get:17 http://archive.ubuntu.com lucid/multiverse Packages [180kB]
Get:18 http://archive.ubuntu.com lucid/multiverse Sources [119kB]
Get:19 http://archive.ubuntu.com lucid-updates/main Packages [452kB]
Get:20 http://archive.ubuntu.com lucid-updates/restricted Packages [3240B]
Get:21 http://archive.ubuntu.com lucid-updates/main Sources [181kB]
Get:22 http://archive.ubuntu.com lucid-updates/restricted Sources [1443B]
Get:23 http://archive.ubuntu.com lucid-updates/universe Packages [190kB]
Get:24 http://archive.ubuntu.com lucid-updates/universe Sources [68.2kB]
Get:25 http://archive.ubuntu.com lucid-updates/multiverse Packages [8427B]
Get:26 http://archive.ubuntu.com lucid-updates/multiverse Sources [4369B]
Get:27 http://archive.ubuntu.com lucid-security/main Packages [146kB]
Get:28 http://archive.ubuntu.com lucid-security/restricted Packages [14B]
Get:29 http://archive.ubuntu.com lucid-security/main Sources [46.2kB]
Get:30 http://archive.ubuntu.com lucid-security/restricted Sources [14B]
Get:31 http://archive.ubuntu.com lucid-security/universe Packages [64.8kB]
Get:32 http://archive.ubuntu.com lucid-security/universe Sources [19.3kB]
Get:33 http://archive.ubuntu.com lucid-security/multiverse Packages [1995B]
Get:34 http://archive.ubuntu.com lucid-security/multiverse Sources [651B]
Fetched 12.3MB in 36s (334kB/s)
Reading package lists... Done
W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7D2C7A23BF810CD5
seb@TelAttract:~$
seb@TelAttract:~$ sudo dpkg --clear-avail
seb@TelAttract:~$
seb@TelAttract:~$ sudo dpkg --configure -a
seb@TelAttract:~$
seb@TelAttract:~$ 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.
seb@TelAttract:~$
seb@TelAttract:~$ 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.
seb@TelAttract:~$
seb@TelAttract:~$ LANG=C;sudo apt-get update -o APT::Cache-Limit=25165824 && sudo apt-get dist-upgrade

You have not authorised the digital signature key for launchpad.

See post 7 of this thread:
http://ubuntuforums.org/showthread.php?t=1046734