I've been regularly keeping my 16.04 up to date with the software updater. When I tried to upgrade to 18.04, it took a long time, then at the very end popped up a box saying it failed (bad enough in itself), but also my machine might (!) be in an unusable state. I should have screenshotted it; I was only given the option of clicking OK or something, so I'm not sure of the wording. I seem to be running for now, but I'm afraid to reboot.
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