My Kubuntu system had been corrupted apparently. The problem has disappeared after I have completely re-installed Kubuntu.
Thank you, Klaus. -- Kubuntu Feisty: can't install kompare and cscope https://bugs.launchpad.net/bugs/126983 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs