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Every time I want to open Software Center to install something, my computer hangs before it starts. What could be the problem?

AND

When I try sudo apt-get update and type my password, in the end of that I get error:

W: GPG error: http://repo.steampowered.com precise InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F24AEA9FB05498B7

EDIT

When I run software-center command from terminal, it does not give any errors, only thing it writes in output is:

Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated.
2012-12-23 15:55:18,554 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2012-12-23 15:55:19,000 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True

and after that it stays that way...

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2 Answers

It looks like you have installed steam without importing the key. Run the following commands:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F24AEA9FB05498B7
sudo apt-get update

It will import the key for the steam repository. Now you can open the Software Center again.

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hm.. no, it imported key, but still can't open software center :( p.s. now sudo apt-get update haven't gived any errors –  geoh Dec 23 '12 at 7:23
    
Does Software Center give any errors when you run it by typing 'software-center' in a terminal? –  Zilvador Dec 23 '12 at 10:21
    
I made edit, could you look at that please. –  geoh Dec 23 '12 at 11:59
    
Hmm... try 'sudo apt-get --reinstall install software-center' –  Zilvador Dec 23 '12 at 13:19
    
i reinstalled it, and now when i run it from terminal, computer still works, but nothing changes. it writes output in edit, and stays that way. :( –  geoh Dec 23 '12 at 14:20
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there is a all time default solution which I am following if I saw any thing like that .

open your terminal sudo rm -rf /var/lib/apt/lists/*

paste the above line . try again .

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ok, now trying .. –  geoh Dec 22 '12 at 7:21
    
sorry, but problem still be continuing.. –  geoh Dec 22 '12 at 7:29
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