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

Sat Feb 27 00:02:26 UTC 2021

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

Status in ubiquity 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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