I just upgraded from from 7.10 to 8.04 (using the updated manager in KDE) and had this problem too. The solution was to add my hostname to the /etc/hosts file on the end of the line containing 127.0.0.1. I was able to open up /etc/hosts as root by using the command:
su -c "nano /etc/hosts" -- Missing hostname in /etc/hosts causes sudo to fail https://bugs.launchpad.net/bugs/19775 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
