Can't open Synaptic Package Manager

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. The error you're seeing is caused by a syntax problem in your /etc/apt/sources.list on line 176. We appreciate the difficulties you are facing, but it would make more sense to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs.

In the meantime, please post your /etc/apt/sources.list in the support tracker for further assistance

Thank you

Please copy and paste the contents of your /etc/apt/sources.list here.

Thank you

As requested above post your /etc/apt/sources.list

It it more likely than not something like a simple typing error on line 176 which is not allowing it to parse the file correctly.

from /etc/apt/sources.list

deb cdrom:[Ubuntu 8.04 _Hardy Heron_ - Release amd64 (20080423)]/ hardy
main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:

## Major bug fix updates produced after the final release of the
## distribution.
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ hardy-backports main restricted
universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository. This software is not part of Ubuntu, but is
## offered by Canonical and the respective vendors as a service to Ubuntu
## users.
deb http://archive.canonical.com/ubuntu hardy partner

# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:
# Line commented out by installer because it failed to verify:
deb http://us.archive.ubuntu.com/ubuntu/ hardy main universe restricted
multiverse
deb http://security.ubuntu.com/ubuntu/ hardy-security universe main
multiverse restricted
deb http://us.archive.ubuntu.com/ubuntu/ hardy-updates universe main
multiverse restricted
deb http://us.archive.ubuntu.com/ubuntu/ hardy-proposed universe main
multiverse restricted

deb http://ppa.launchpad.net/exaile-devel/ubuntu hardy main

deb-src http://archive.ubuntu.com/ubuntu hardy-proposed universe multiverse
deb-src http://archive.ubuntu.com/ubuntu hardy-security universe multiverse
deb-src http://archive.ubuntu.com/ubuntu hardy-updates universe multiverse
deb http://archive.ubuntu.com/ubuntu/ hardy restricted main multiverse
universe
deb http://archive.ubuntu.com/ubuntu/ hardy-backports restricted main
multiverse universe
deb http://archive.ubuntu.com/ubuntu/ hardy-proposed restricted main
multiverse universe
deb http://archive.ubuntu.com/ubuntu/ hardy-security restricted main
multiverse universe
deb http://archive.ubuntu.com/ubuntu/ hardy-updates restricted main
multiverse universe
deb http://asher256-repository.tuxfamily.org ubuntu french
deb http://cl.naist.jp/~eric-n/ubuntu-nlp hardy all
# deb-src http://cl.naist.jp/~eric-n/ubuntu-nlp hardy all
deb http://deb.opera.com/opera etch non-free
deb http://debian.geole.info/ etch main contrib non-free
# deb-src http://debian.geole.info/ etch main contrib non-free
deb http://debian.geole.info/ etch-backports main contrib non-free
# deb-src http://debian.geole.info/ etch-backports main contrib non-free
deb http://dl.google.com/linux/deb/ stable non-free
deb http://dl.google.com/linux/deb/ testing non-free
deb http://download.skype.com/linux/repos/debian/ stable non-free
deb http://download.tuxfamily.org/3v1deb feisty 3v1n0 suspend2
deb-src http://download.tuxfamily.org/3v1deb feisty 3v1n0
deb http://download.tuxfamily.org/geubuntu/ gutsy/
deb http://e17.dunnewind.net/ubuntu gutsy e17
deb http://e17.dunnewind.net/ubuntu hardy e17
# deb-src http://e17.dunnewind.net/ubuntu hardy e17
# deb
http://ftp.osuosl.org/pub/pculture.org/miro/linux/repositories/ubuntu
feisty/
deb http://getswiftfox.com/builds/debian unstable non-free
deb http://lprod.org/deb/hardy/ ./
# deb-src http://lprod.org/deb/hardy/ ./
deb http://mi.mirror.garr.it/ubuntu hardy-backports main restricted
universe multiverse
# deb-src http://mi.mirror.garr.it/ubuntu hardy-backports main
restricted universe multiverse
deb http://morgoth.free.fr/ubuntu hardy-backports main
# deb-src http://morgoth.free.fr/ubuntu hardy-backports main
deb http://ppa.launchpad.net/do-core/ubuntu hardy main
deb http://ppa.launchpad.net/gilir/ubuntu hardy main universe
deb http://ppa.launchpad.net/kubuntu-members-kde4/ubuntu hardy main
deb http://ppa.launchpad.net/mvo/ubuntu hardy main
deb http://snapshots.ekiga.net/debian/ sid main
deb http://ubuntu.davromaniak.eu hardy-depomaniak all
# deb-src http://ubuntu.davromaniak.eu hardy-depomaniak all
deb http://us.ubuntu.cafuego.net/dists/hardy-cafuego/ hardy-cafuego #Cafuego
deb http://wine.budgetdedicated.com/apt hardy main
# deb-src http://wine.budgetdedicated.com/apt hardy main

****************************
marcobra wrote:
> Your question #38318 on update-manager in ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/update-manager/+question/38318
>
> Status: Open => Needs information
>
> marcobra requested for more information:
> Please copy and paste the contents of your /etc/apt/sources.list here.
>
> Thank you
>
>

Thanks Bhavani Shankar, that solved my question.