This sounds pretty similar to bug 43233, which I believed to be long fixed. Does it work for you to use "sudo -k"?
** Changed in: sudo (Ubuntu) Status: New => Incomplete -- sudo doesn't work if system time is changed https://bugs.launchpad.net/bugs/213777 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