If you can't ssh in then that sounds like a kernel problem. So please:
1. Reproduce the freeze again.
2. Reboot only once.
3. Run:
journalctl -b-1 > prevboot.txt
and attach the resulting text file here.
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Summary changed:
- Xorg freeze
+ System freeze
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1881435
Title:
System freeze
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1881435/+subscriptions
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