Why does my Ubuntu 20.04 installation sometimes hang on booting?

Krisztián Balla

Sometimes (I would guess in about 25% of the cases) my new Ubuntu 20.04 LTS installation freezes during the boot process.

These are the last messages that are shown in the console when this happens:

[  OK  ] Started Snap Daemon.
Starting Wait until snapd is fully seeded...
[  OK  ] Finished Wait until snapd is fully seeded.
Starting resolvconf-pull-resolved.service...
[  OK  ] Finished resolvconf-pull-resolved.service.

When I press Ctrl + Alt + Del to initiate a reboot. The system is going down, but displays the following message:

[  *** ] A stop job is running for Light Display Manager (35s / 1min 30s)

This is quite unusual. I haven't seen this message before. I don't know if the two things are related.

Does anybody have any ideas what could be the problem here and how to fix it?

user1091774

This can sometimes happen when there is a conflict between systemd and the Intel display drivers. I haven't seen this particular issue for years, but you should be able to fix it with a little workaround:

create a file as root named /etc/sysctl.d/50-coredump.conf
Paste:
kernel.core_pattern=core
Reboot

This should resolve the issue.

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edited at2021-05-3

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Why does my Ubuntu 20.04 installation sometimes hang on booting?

Why does my Ubuntu 20.04 installation sometimes hang on booting?

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