I can confirm this. Installed smb4k, went to 'settings - Configure smb4k', under 'super user', changed any setting, clicked apply. After that, permissions of the file changed from 440 to 640.
Rebooted in recovery mode (root shell), changed permissions back to 440: chmod 440 /etc/sudoers Rebooted, and sudo is working again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/683071 Title: smb4k super user privileges leaves wrong permissions on /etc/sudoers -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs