I am also suffering from this bug. Software Center and Update Manager initially worked but now exhibit these exact same symptoms. I can't pin down an exact change that may have caused this.
I am willing to provide any detail or debugging steps necessary to troubleshoot this issue. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/775425 Title: software center works only if started from terminal with "sudo" -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
