3
% journalctl
...
Dec 14 22:37:30 ray-desktop kernel: mce: [Hardware Error]: Machine check events logged
-- Reboot --
Dec 14 22:40:08 ray-desktop kernel: microcode: microcode updated early to revision 0x8e, date = 2018-03-24
...

/var/log/kern.log has:

...
Dec 14 22:37:30 ray-desktop kernel: [539775.847567] mce: [Hardware Error]: Machine check events logged
Dec 14 22:40:09 ray-desktop kernel: [    0.000000] microcode: microcode updated early to revision 0x8e, date = 2018-03-24
Dec 14 22:40:09 ray-desktop kernel: [    0.000000] Linux version 4.15.0-42-generic (buildd@lgw01-amd64-023) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC 2018 (Ubuntu 4.15.0-42.45-generic 4.15.18)
...

But Ubuntu 18.04 has no mcelog command or /var/log/mcelog file.

So where are the events logged?

Or more generally, how do I determine what hardware failed?

0

mcelog was removed in Debian 10+ (Buster) and Ubuntu 18.04+

The functionality has been replaced by rasdaemon.

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