Public bug reported:

After updating to linux-image-4.15.0-177-generic, my machine completely
freezes on the Ubuntu Welcome screen, i.e. right after switching to GUI
mode. The mouse pointer is frozen, the keyboard does not even respond to
CAPS LOCK or NUM LOCK, pressing CTRL+ALT+F2 shows no reaction.

I cannot work with my machine at this point and have to hard reset it.

Selecting advanced boot options in grub and selecting the previous linux
kernel 4.15.0-176 makes it work again. So this bad bug was introduced
with the 4.15.0-177 kernel release.

I tried removing the nvidia-driver-510 package, presumably making Ubuntu
use the "nouveau" driver, and with that, I could use the welcome screen
and log in, but the machine still froze shortly afterwards.

So maybe this is some sort of interference with my GeForce 1080 graphics
card, but it is not specific to the driver used.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-177-generic:amd64 4.15.0-177.186
ProcVersionSignature: Ubuntu 4.15.0-176.185-generic 4.15.18
Uname: Linux 4.15.0-176-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.27
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  robert     2082 F.... pulseaudio
 /dev/snd/controlC0:  robert     2082 F.... pulseaudio
 /dev/snd/controlC2:  robert     2082 F.... pulseaudio
CurrentDesktop: Unity:Unity7:ubuntu
Date: Thu May 12 13:36:28 2022
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-10-29 (2386 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Supermicro Super Server
ProcFB:
 
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-176-generic 
root=UUID=7c296e4d-0189-43a0-aef8-7d536b98a536 ro
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-176-generic N/A
 linux-backports-modules-4.15.0-176-generic  N/A
 linux-firmware                              1.173.21
RfKill:
 
SourcePackage: linux
UpgradeStatus: Upgraded to bionic on 2019-07-29 (1017 days ago)
dmi.bios.date: 09/18/2020
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3.4
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: X11SAE
dmi.board.vendor: Supermicro
dmi.board.version: 1.01
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 17
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 0123456789
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3.4:bd09/18/2020:svnSupermicro:pnSuperServer:pvr0123456789:rvnSupermicro:rnX11SAE:rvr1.01:cvnSupermicro:ct17:cvr0123456789:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: Super Server
dmi.product.version: 0123456789
dmi.sys.vendor: Supermicro

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1973167

Title:
  linux-image-4.15.0-177-generic freezes on the welcome screen

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