yes, the sudo failed on getnamebyhost（）。 This is maybe terrible, because you must get the root power by grub (recover mode) and fix the /etc/hosts file to correctly. Or you almost can't do anything(a lot of things need use the sudo command).
-- Missing hostname in /etc/hosts causes sudo to fail https://launchpad.net/bugs/19775 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
