I have a Dell Optiplex 9020 which was running Ubuntu 14.04LTS. Ubuntu complained that it was out of date and no longer providing security updates. Of course, it did not offer a way to upgrade, but looking it up on stackexchange, I found the following advice:
Can I smoothly upgrade from one LTS to next LTS release?
sudo apt-get do-release-upgrade
Now the machine locks up after booting. I can't see anything in a log. There is a text cursor. Alt-F* does not work to get to a shell.
I can press the power button, and it then shows the ubuntu logo before shutting down in a controlled manner. So Linux is running.
Any ideas as to how to recover my system? I am assuming I should type some options in grub.
Booting with Linux 3.16.0-77-generic (recovery mode)
Recovery mode shows:
Started user manage for UID 112
started automatic USB/bluetooth printer setup...
Failed to start Network manager wait online
At this point ctrl-alt-del does not work, but pressing the power button does continue through the sequence and shut down.
