My server was all setup and working fine until I installed the Monero node. I went through everything you just went through plus replacing the CMOS battery and adjusting the installed memory sticks. The final solution was to restore from backup, same as you. Now my server is back to normal but I have to resync the Bitcoin blockchain and such.
I think there are enough examples of the Monero app causing problems that it needs to be updated or removed. I think I’m gonna avoid the community apps for now too unless there’s better auditing. All this troubleshooting took two hours out of my day and time is precious.