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Possible Duplicate:
Software center not opening

When opening software center, the operation is stuck after opening the window and upper bar. The error message when launching from terminal is:

2012-06-19 12:53:33,684 - - WARNING - Could not get usefulness from server, no username in config file
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marked as duplicate by jokerdino, Jorge Castro, stephenmyall, Mik, belacqua Oct 30 '12 at 16:22

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.

I got it by myself.. this fixed the problem for me.. in terminal i typed :: rm -r ~/.cache/software-center – ofer Jun 19 '12 at 11:21

The OP solved this by opening the terminal with Ctrl+Alt+T and typing:

rm -r ~/.cache/software-center
  • When doing this, it's very important to not accidentally have a space after ~ or the first /. If you do, it will remove all the files in your home directory, which generally includes all your documents!

  • An alternative command to run, which doesn't turn into such a bad thing when typed slightly wrong, is this:

    cd ~/.cache; rm -r software-center
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