Happened to me when upgrading from 15.10 to 16.04 Beta 2. The UPS battery was fully charged, but during the upgrade the battery icon showed the battery as fully discharged and the computer was shut down before the upgrade completed.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1521024 Title: Upgrade halts with invalid UPS low battery warning To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1521024/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs