Thanks for your report. Something has probably gone wrong with a previous install. This happens when package has been configured but triggers have not been "triggered"
You can solve this by running the following command: sudo apt-get install --reinstall sudo Let us known if this fixes your problem. ** Changed in: apt (Ubuntu) Status: New => Incomplete -- package sudo 1.6.9p10-1ubuntu3.3 failed to install/upgrade: package sudo is already installed and configured https://bugs.launchpad.net/bugs/271164 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs