I'm unable to install bleachbit on my laptop running Ubuntu 12.04. The Ubuntu Software Centre shows that the package is available from the Universe software source and I have the option to "use this source" but after that, it gets stuck while quering software sources.
How can I fix this problem? It's occurred to me that perhaps this could be from software sources being deleted in my configuration. If so, can someone tell me the default list of software sources?
plz help me out and sorry for my poor english