I'm using this same version of ubuntu. Before crash I've opened new terminal window Ctrl + Alt + F1 and then I 'saw NMI watchdog: BUG: soft lockup - CPU#2 stuck for 23s! [plymouthd:305]'. In my case this do the trick: https://askubuntu.com/questions/875173/nmi-watchdog-bug-soft-lockup-cpu2-stuck-for-23s-plymouthd305
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