[Bug 1916971] Re: After fresh Ubuntu 20.04 install, downgrading Nvidia driver doesn't update nvidia modules in kernel

Fri Mar 5 09:59:03 UTC 2021

Can you please provide the output of:

$ sudo ubuntu-drivers list

In the live session?

There are two ways to get the nvidia kernel driver. One option is to
compile it from scratch on the users machine with dkms. THe other option
is to install a metapackage linux-modules-nvidia for the appropriate
kernel flavour and the appropriate nvidia revsision which provides a
prebuild, not linked, and secureboot signed nvidia module.

So as to why.... the dkms one will not work or load on secureboot
machines, unless one goes through cryptic MOK key enrollment procedure
during boot.

The secureboot signed nvidia module works on secureboot machines without
any additional steps by the user.

But the caveat is that the secureboot signed ones must be kept in
correct tandem with the kernel flavour & nvidia revisions.

Anything you install from the PPA will not be secureboot signed, and
thus need MOK signing.

** Also affects: nvidia-graphics-drivers-460 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-drivers-common (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1916971

Title:
  After fresh Ubuntu 20.04 install, downgrading Nvidia driver doesn't
  update nvidia modules in kernel

Status in nvidia-graphics-drivers-460 package in Ubuntu:
  New
Status in ubiquity package in Ubuntu:
  New
Status in ubuntu-drivers-common package in Ubuntu:
  New

Bug description:
  SYSTEM:

  Laptop: ASUS ROG GL552VW
  OS: Ubuntu 20.04.2 LTS
  GRAPHICS: Nvidia Geforce GTX 960m AND Intel HD Graphics
  Linux kernel version: 5.8.0-44-generic

  SUMMARY:

  From a fresh working install of Ubuntu 20.04, I downgraded from
  nvidia-driver-460 by installing nvidia-driver-440 (which actually is a
  transitional package to nvidia-driver-450 but I didn't know this).
  After reboot I couldn't reach login-screen and instead got a black
  screen.

  Problem was that sudo apt-get install nvidia-driver-440 did not insert
  nvidia modules v450 in kernel since never versions v460 were found.

  This was solved by uninstalling linux-modules-nvidia-460 packages and
  instead installing linux-modules-nvidia-450 packages (see WORKAROUND
  below for instructions).

  STEPS TO REPRODUCE:

  Install Ubuntu 20.04. During installation, allow for the installation
  of proprietary drivers.

  Once Ubuntu 20.04 has started, open a terminal and run the following:

  sudo add-apt-repository ppa:graphics-drivers/ppa
  sudo apt-get update
  sudo apt-get install nvidia-driver-440
  sudo shutdown reboot now

  PROBLEM:

  After reboot, you can't reach login screen. Instead you get stuck
  during bootup.

  WORKAROUND:

  WARNING: BETTER WORKAROUND PROBABLY EXISTS! DON'T JUST COPY-PASTE
  INSTRUCTIONS. PAY ATTENTION TO WHAT NVIDIA DRVER AND LINUX KERNEL
  VERSIONS ARE RELEVANT FOR YOU! Run dpkg --list | grep linux-image to
  see what linux kenrel versions you have installed.

  Remove the linux-modules-nvidia-460 packages and install the
  corresponding linux-modules-nvidia-450 packages. In my case I had
  Linux kernel versions 5.8.0-44-generic and 5.8.0-43-generic installed
  so I did as follows from recovery mode with network (instead of
  entering recovery mode, you should be able to press CTRL+ALT+F1 from
  the blank screen after bootup, login with username and password and
  then running these commands):

  sudo apt-get autoremove --purge linux-modules-nvidia-460-5.8.0-44-generic linux-modules-nvidia-460-5.8.0-43-generic
  sudo apt-get install linux-modules-nvidia-450-5.8.0-44-generic linux-modules-nvidia-450-5.8.0-43-generic
  sudo shutdown reboot now

  QUESTION:

  Why was the linux-modules-nvidia-460 packages installed by the Ubuntu
  installer to begin with? I ask since I later removed the linux-
  modules-nvidia-450 packages (OBSERVE: 450, not 460) and used the
  Additional Drivers GUI to update back to nvidia-driver-460. Now linux-
  modules-nvidia-460 packages are NOT installed but the following still
  outputs 460:

  modinfo nvidia | grep -i version

  LOG:

  This is a relevant part of /var/log/apt/term.log for when I installed
  nvidia-driver-440

  nvidia.ko:
  Running module version sanity check.
  Error! Module version 450.102.04 for nvidia.ko
  is not newer than what is already found in kernel 5.8.0-44-generic (460.39).
  You may override by specifying --force.

  nvidia-modeset.ko:
  Running module version sanity check.
  Error! Module version 450.102.04 for nvidia-modeset.ko
  is not newer than what is already found in kernel 5.8.0-44-generic (460.39).
  You may override by specifying --force.

  nvidia-drm.ko:
  Running module version sanity check.
  Error! Module version 450.102.04 for nvidia-drm.ko
  is not newer than what is already found in kernel 5.8.0-44-generic (460.39).
  You may override by specifying --force.

  nvidia-uvm.ko:
  Running module version sanity check.
   - Original module
     - No original module exists within this kernel
   - Installation
     - Installing to /lib/modules/5.8.0-44-generic/updates/dkms/

  This is a relevant part of /var/log/apt/term.log for when I installed
  packages linux-modules-nvidia-450-5.8.0-44-generic and linux-modules-
  nvidia-450-5.8.0-43-generic

  Building module:
  cleaning build area...
  unset ARCH; [ ! -h /usr/bin/cc ] && export CC=/usr/bin/gcc; env NV_VERBOSE=1 'make' -j8 NV_EXCLUDE_BUILD_MODULES='' KERNEL_UNAME=5.8.0-43-generic IGNORE_XEN_PRESENCE=1 IGNORE_CC_MISMATCH=1 SYSSRC=/lib/modules/5.8.0-43-generic/build LD=/usr/bin/ld.bfd modules............
  Signing module:
   - /var/lib/dkms/nvidia/450.102.04/5.8.0-43-generic/x86_64/module/nvidia-modeset.ko
   - /var/lib/dkms/nvidia/450.102.04/5.8.0-43-generic/x86_64/module/nvidia-uvm.ko
   - /var/lib/dkms/nvidia/450.102.04/5.8.0-43-generic/x86_64/module/nvidia-drm.ko
   - /var/lib/dkms/nvidia/450.102.04/5.8.0-43-generic/x86_64/module/nvidia.ko
  Secure Boot not enabled on this system.
  cleaning build area...

  DKMS: build completed.

  nvidia.ko:
  Running module version sanity check.

  Good news! Module version 450.102.04 for nvidia.ko
  exactly matches what is already found in kernel 5.8.0-43-generic.
  DKMS will not replace this module.
  You may override by specifying --force.

  nvidia-modeset.ko:
  Running module version sanity check.

  Good news! Module version 450.102.04 for nvidia-modeset.ko
  exactly matches what is already found in kernel 5.8.0-43-generic.
  DKMS will not replace this module.
  You may override by specifying --force.

  nvidia-drm.ko:
  Running module version sanity check.

  Good news! Module version 450.102.04 for nvidia-drm.ko
  exactly matches what is already found in kernel 5.8.0-43-generic.
  DKMS will not replace this module.
  You may override by specifying --force.

  nvidia-uvm.ko:
  Running module version sanity check.
   - Original module
     - No original module exists within this kernel
   - Installation
     - Installing to /lib/modules/5.8.0-43-generic/updates/dkms/

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubiquity (not installed)
  ProcVersionSignature: Ubuntu 5.8.0-44.50~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-44-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Feb 26 01:26:35 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  InstallationDate: Installed on 2021-02-24 (1 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
  SourcePackage: ubiquity
  Symptom: installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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