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Last time I installed Ubunu I notice that in Ubuntu app center, most apps are missing install button, instead it is "Use this source" button and i can't install anything.

I've tried to use update command in terminal but it didn't work, they say it was internet error but I'm using Firefox right now.

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up vote 0 down vote accepted

You should add ubuntu software repository to your software sources. Here is the instructions.

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Thanks for your answer but it Didn't work i'll try reinstall 12.10 – user166579 Jun 12 '13 at 15:17
What did you do exactly? What is the contents of /etc/apt/sources.list? – Mohammad Etemaddar Jun 13 '13 at 6:13

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