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I got an error icon above my menu bar. When I click on it I get three options with some details. It says

An error occurred please run package manager from the right-click menu or apt-get in terminal to see what's wrong.
The error message was: 'Error:brokencount>0'.
This usually means that your installed packages have unmet dependencies"

I tried apt-get in terminal, with commands and options it says

See the apt-get(8), sources.list(5) and apt.conf(5) manual pages for more information and options. This APT has Super Cow Powers.

When I tried to update my system it failed to update and showed this error message:

The package is broken

The following packages have unmet dependencies:
steam-launcher: Depends: curl but it is not installed
                Depends: jockey-common but it is not installed
                Depends: libc6 (>= 2.15) but 2.15-0ubuntu20 is installed
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marked as duplicate by Eliah Kagan, con-f-use, raaz, hhlp, Kevin Bowen Mar 20 '13 at 10:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

2 Answers

Try in a terminal:

sudo apt-get update
sudo apt-get autoclean
sudo apt-get autoremove
sudo apt-get -f dist-upgrade

It should update package list, remove any unnecessary packages, fix broken packages and manage dependencies.

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if you try and have an error, can you let me know ? –  ttoine Mar 19 '13 at 14:53
    
I tried these commands sir but when I try last command it shows me this –  Faisal Aslam Mar 20 '13 at 13:21
    
Failed to fetch archive.ubuntu.com/ubuntu/pool/main/s/shotwell/… 403 Forbidden [IP: 91.189.92.200 80] E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? –  Faisal Aslam Mar 20 '13 at 13:23
    
it seems you have many problems with packages. you should try changing the mirror you are using to main, and update again. –  ttoine Mar 21 '13 at 12:13
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sudo apt-get install steam-launcher This command should install steam-launcher and the dependencies that needs. If you continues with problem maybe you can try using sudo apt-get install -f steam-launcher

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by trying this command sudo apt-get install steam-launcher I got this error Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package steam-launcher –  Faisal Aslam Mar 20 '13 at 13:24
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