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Changing some Software Update settings I possibly corrupted something, and now I don't see many packages in the list. For example:

alex@u120464:~$ sudo apt-get install codeblocks
[sudo] password for alex: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package codeblocks

I checked all options in the Software Sources dialog, but packages are still not available. How can I fix this?

OS: Ubuntu 12.04, 64 bit.

Additional information.

alex@u120464:~$ sudo apt-get update
[sudo] password for alex: 
Ign http://extras.ubuntu.com precise InRelease
Ign http://security.ubuntu.com precise-security InRelease           
Ign http://archive.canonical.com precise InRelease                  
Ign http://archive.ubuntu.com precise InRelease
Ign http://archive.ubuntu.com precise-updates InRelease
...

It looks like most Ubuntu repositories are not searched, how can I restore default update behaviour?

Edit.

Finally, the problem was solved by copying /etc/apt/source.list file from another computer. This is the offending file content:

# deb cdrom:[Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)]/ dists/precise/main/binary-i386/

# deb cdrom:[Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)]/ dists/precise/restricted/binary-i386/
# deb cdrom:[Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)]/ precise main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://il.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://il.archive.ubuntu.com/ubuntu/ precise main restricted

## Major bug fix updates produced after the final release of the
## distribution.

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.

## 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.

## 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.


## 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 precise partner
deb-src http://archive.canonical.com/ubuntu precise partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
deb http://mirror.sov.uk.goscomb.net/ubuntu/ precise main universe restricted multiverse
deb-src http://mirror.sov.uk.goscomb.net/ubuntu/ precise universe main multiverse restricted #Added by software-properties
deb http://security.ubuntu.com/ubuntu/ precise-security universe main multiverse restricted
deb http://mirror.sov.uk.goscomb.net/ubuntu/ precise-updates universe main multiverse restricted
deb http://mirror.sov.uk.goscomb.net/ubuntu/ precise-backports universe main multiverse restricted
deb-src http://extras.ubuntu.com/ubuntu precise main
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1  
did you successfully updated all the lists? try sudo apt-get update (also can perform a upgrade sudo apt-get upgrade) –  Web-E Dec 7 '12 at 8:03
    
@Web-E: the question is edited. –  Alex Farber Dec 7 '12 at 11:15
    
Changing Update server doesn't help. –  Alex Farber Dec 7 '12 at 11:20

2 Answers 2

up vote 0 down vote accepted

Solved by copying /etc/apt/sources.list file from another computer.

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did you save the old one for comparing purpose ? –  martin-mystere Dec 7 '12 at 12:25
    
@martin-mystere - the old one is added to the question. I have no idea what is wrong in it. –  Alex Farber Dec 7 '12 at 15:49

Please, open-up update-manager or Software Sources depending on your distro then add/tick universe repository from the software sources.

Read https://help.ubuntu.com/community/Repositories/Ubuntu "Adding Repositories in Ubuntu"

GUI-based repository management is normally accomplished via "Software Sources". This interface can be accessed via several methods. For the latest versions of Ubuntu, the easiest way is to go through the "Ubuntu Software Center". Open the software center, then from the Edit menu select "Software Sources". You will have to enter your password to change settings in this window.

For older versions of ubuntu, there are several options:

Main Menu: System > Administration > Software Sources.

Synaptic : System > Administration > Synaptic Package Manager : >> Settings >> Repositories.

Main Menu: Ubuntu Software Center : >> Edit, Software Sources. 

Ubuntu Software Tab

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Thanks, universe repository is checked. I checked everything possible in the Software Sources dialog, but most packages are still unavailable. –  Alex Farber Dec 7 '12 at 11:56

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