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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https://bugs.launchpad.net/bugs/1798961

Title:
  Random unrecoverable freezes on Ubuntu 18.10

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