I've tried to upgrade 19.04 to 19.10. Now when I start the system, it loads, but is not usable as the only thing I see is "Oh no! Something has gone wrong". I can see activities though and there are "Sorry, Ubuntu 19.10 has experienced an internal error" and "System program problem detected" windows, but I can't get to them -- it goes back to "Oh no!" window.

Upgrade process was not smooth. At some point the messages were displayed:

lvm2-activation-generator: lvmconfig failed
lvm2-activation-generator: Activation generator failed.

I fixed this problem, following this advice: Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

This is similar problem, but for me disabling autologin hasn't helped: Unable to login after upgrading to 19.10 from 19.04

  • I had this issue. Luckily my solution was straightforward (not posting as an answer because this scenario was particular to my setup and probably not general enough.) mysql had written a symbolic link from /etc/mysql/my.conf.fallback -> /var/archive/mysql/my.conf and the /var/archive/mysql/my.conf was a symbolic link to - you guessed it: /etc/mysql/my.conf.fallback. SMH. – eggmatters Feb 9 at 19:55

So the reason was indeed the interrupted update process. Fixed this as described here: How do I resume a release upgrade?

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