Linux Mastering Development Ubuntu

Segmentation fault / fail to boot after CPU upgrade?

My machine is a HP ProDesk 400 G4 SFF running Ubuntu Server 20.04.

It was running just fine with the original Intel i5-6500 CPU, but upon upgrading to an i7-6700 the system will no longer boot.

I’ve tried entering rescue mode and emergency mode, but neither of them will actually boot the system. Any ideas?

EDIT: I’m unable to boot from install media on a USB drive either. Here is a screenshot of a failed boot:

segmentation fault

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