Sorry this bug happened a long time ago and, as there was no way to fix it, I finally re-installed Ubuntu with the desktop-CD.
Of course , if you want to do same don't forget to save your /etc/apt/sources.list and your package list on an external device ( "sudo dpkg --set-selections< packages-list" saves it;" sudo dpkg --set-selections< packages-list " + " sudo apt-get dselect update "+ " sudo apt-get dselect-upgrade " restores, and keep your home (only format the " / " partition when partition-manager asks) Days and night to look for a solution......Only 1 hour and half to re-install and have a clean Ubuntu (A look-a-like of the previous one, settings and bookmarks included)... Make your mind forgive me if my english is so-so but I'm sure your french is not better :)) -- update icon in upper taskbar , when clic on it ,got an error message https://bugs.launchpad.net/bugs/126803 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs