Logging out and logging back in is not supposed to expire your sudo ticket. This is normal.
Here's a proper test: sudo ls (wait 20 minutes) sudo ls -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/747158 Title: sudo temp permission not being revoked. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
