Well, found out that two screensavers were installed - the old xscreensaver and the new light locker. I'm not sure yet, but thought about that the two caused the trouble. For some unknown reasons, the old xcreensaver didn't get uninstalled from my previous upgrades from the last couple of years. Have seen complaints and bug reports for this. So, might the case that at least one of them was active while doing the upgrade... However, this does not explain why there was no switch into a console possible.
As far as I have seen from the logs attached, the upgrade just stopped... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1559463 Title: Upgrade trusty -> xenial failed - blank screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1559463/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
