I would be curious to see what a fresh install looks like. Because when
you first started reporting these bugs you had disabled the open source
driver in the kernel, didn't have the proprietary driver installed, and
had installed a custom unsupported kernel. So I am still skeptical that
some of those changes, or other changes, may have broken the system.

Sorry it's so complicated... Nvidia retires their "old" hardware very
quickly. Even when many of us would not consider it "old". Yours is in
the process of being retired as it's only "supported" via an old driver.
And that old driver is too old for newer kernels. It would be easy to
blame Nvidia but you have to remember that these problems don't happen
on Windows. So I would also blame the design of the Linux kernel for not
providing a stable ABI (one that doesn't require rebuilding drivers).

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-graphics-drivers-340 in Ubuntu.
https://bugs.launchpad.net/bugs/1889541

Title:
  Booting Ubuntu with Nvidia-340 gets stuck on a plain purple screen

Status in nvidia-graphics-drivers-340 package in Ubuntu:
  New

Bug description:
  When I install the proprietary NVidia drivers, even if I set:
  - nosplash noveau.modeset=0 in grub
  - WaylandEnable=false in /etc/gdm3/custom.conf

  My system keeps staying on the purple screen before asking for login.
  The System is accessible and working via SSH.

  After a thread in bug 1889377, @vanvugt suggested to me the following 
procedure:
  [QUOTE]
  We would need to see the system log from one of those failed boots. To do 
that please:

  1. Reproduce a failed boot with nvidia-340.

  2. Uninstall nvidia-340 and after rebooting collect the log from the
  previous failed boot. For example, to collect the last three boots
  run:

     journalctl -b-1 > prevboot-1.txt
     journalctl -b-2 > prevboot-2.txt
     journalctl -b-3 > prevboot-3.txt

  and then please open a new bug with those logs attached.
  [/QUOTE]

  Attached the three files.

  Aditional info:
  1) Ubuntu 20.04.1 LTS
  2) nvidia-340
  3) system boots
  4) system is not booting

  Thanks for helping.
  Mirko

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