[adevx]

It probably isn't a configuration that is well tested. I only update servers between LTS releases and take the opportunity to start with a fresh install. I think this makes sense even for Windows servers. Too many things change, not only in hardware configuration/drivers, but also major bumps in software packages eg: nginx, apache, postgresql etc.

[icedchai]

Yes, part of my problem was a few of these systems had been through multiple upgrades: 14.04 -> 16.04 -> 20.04. Still, these are all LTS releases. I was able to fix all of these problems by dropping to single user mode. But I've been working with Linux since 1993...