I solved the problem: I had to remove the directory, by running following commands:
$sudo rm -rf /var/lib/apt/list Then I ran the command: $sudo apt-get update And all things are righ now! Thanks for your help! ** Changed in: update-manager (Ubuntu) Status: Incomplete => Opinion ** Changed in: update-manager (Ubuntu) Status: Opinion => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/780036 Title: update-manager Error:ouverture du cache -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs