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