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In Kubuntu 17.04 in a terminal, I did do-release-upgrade. After the downloading was over, the unpacking, etc. began. I accidentally locked the screen. When I wanted to unlock, it displayed a message

The screen locker is broken ... switch back to running session.

So I switched to virtual terminal, logged in and loginctl unlock-sessions. When I switch back using Ctrl-Alt-F7, it still shows the same message.

When I tried sudo shutdown -h now it gave an error that update manager is inhibiting shutdown.

How do I get out of this mess? It has been more than 3 hours since this happened.

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    I would let it sit. If it goes another 3 hours you can try a hard reboot, but it the upgrade failed you may have to reinstall. Time will tell ...
    – Panther
    Nov 4, 2017 at 7:26
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    @Panther I did as you suggested. And after about 4 hours, did sudo shutdown -h now. Everything went without an error and I could reboot into Kubuntu 17.10
    – deshmukh
    Nov 4, 2017 at 8:06

1 Answer 1

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Upgrades can take a long time and it is best to wait.

The message "update manager is inhibiting shutdown" suggests the upgrade is still in process and interrupting the upgrade, by forcing a shutdown, can break Ubuntu.

I suggest waiting , but if the problem persists in a few hours you can force a reboot, but doing so may cause problems, and in that event you would have to debug (can be difficult or impossible) reinstall (faster, more reliable).

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