There are a lot of threads about incompatibilities and "gotcha" cases that people have run in to with Ubuntu and Nvidia cards, but none like the problem I'm having here.
I have a system with 3 video cards in it; an Nvidia P600, and two GTX 1080s. The Ubuntu installer runs fine with no issues, I can set up a software RAID, and then reboot to the OS.
Ubuntu runs fine in CLI mode without Nvidia drivers, until I run "apt-get -y upgrade".
Once the upgrade is finished and I reboot, I lose video, forever. I have to SSH in to the system to look around and see what's going on, but I can't find any glaring issues or errors in the logs.
This same behavior occurs when "apt-get -y upgrade"ing from a fresh 16.04.1 or 16.04.2 install.
When doing it from 16.04.2, my /var/log/apt/history.log file shows this as the entry for it:
Start-Date: 2017-03-29 18:42:59
Commandline: apt-get -y upgrade
Requested-By: user (1000)
Upgrade: init:amd64 (1.29ubuntu3, 1.29ubuntu4), init-system-helpers:amd64 (1.29ubuntu3, 1.29ubuntu4), grub-common:amd64 (2.02~beta2-36ubuntu3.7, 2.02~beta2-36ubuntu3.8), mdadm:amd64 (3.3-2ubuntu7.1, 3.3-2ubuntu7.2), nano:amd64 (2.5.3-2ubuntu1, 2.5.3-2ubuntu2), grub2-common:amd64 (2.02~beta2-36ubuntu3.7, 2.02~beta2-36ubuntu3.8), resolvconf:amd64 (1.78ubuntu2, 1.78ubuntu4), grub-pc:amd64 (2.02~beta2-36ubuntu3.7, 2.02~beta2-36ubuntu3.8), grub-pc-bin:amd64 (2.02~beta2-36ubuntu3.7, 2.02~beta2-36ubuntu3.8)
End-Date: 2017-03-29 18:43:16
Again, note that I haven't even gotten to the point of installing Nvidia drivers yet; this is purely vanilla Ubuntu, and it's killing video after upgrade.
Can anyone clue me in as to what's going on here?
The issue turned out to be that my cusotmized grub.cfg file was being overwritten by the upgrade.
I had forgotten that a script was running after Ubuntu installation that was adding set linux_gfx_mode=text to /boot/grub/grub.cfg so that it could actually show video on boot, and running apt-get -y upgrade was nuking that.
I edited /etc/grub.d/10_linux instead of /boot/grub/grub.cfg and the change became permanent.
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