Trying to login after upgrading to 23.04 via the GUI prompt. It warns of the dangers of not disabling your lock screen, but I was sure I didn't have a lock screen enabled.
The login prompt pops up, with my username, and a login button, which when clicked causes a blank screen for a second, then the same login screen pops up again.
I can select user "Other..." instead of my full name, and then put in my username, and try either my admin password, or blank (I don't use a login password), but nothing works, just prompts the login loop again. If I put my username into that box, the password box then disappears. I can enter my password first, then enter my username, but if I click tab after entering the username, the password box disappears again.
Based on this, possibly it could be solved by removing nvidia drivers, but my correct login info doesn't work in tty2. There was a question about that here, but never answered. Perhaps I could remove the drivers from the root prompt using the recovery boot option?
I reset my password using this, but nothing changes.
Any advice very gratefully received. Thanks!
Edit: an answer to this suggests I should disable AutomaticLoginEnable in /etc/gdm3/custom.conf but the gdm3 folder doesn't exist in 23.04. Does anyone know where this setting now lives?
Ok, looks like lightdm is my /etc/X11/default-display-manager; /etc/lightdm/lightdm.conf has:
autologin-session=xubuntu
autologin-user=me
autologin-user-timeout=0
Based on online suggestions, I commented out the last 2 lines, saved, rebooted, aaaaand, no change. Based on a different suggestion I uncommented and then deleted my name from the second line. Also no change.
Edit: Next, nano /etc/group and commented out line beginning 'nopasswdlogin'. This at least prompts me for my password, which I have successfully changed/confirmed multiple times with "passwd". It doesn't work.
Edit: added a new user in recovery mode, set a password, added to sudo, password incorrect. Remove passwords from main & new user in /etc/shadow, now in the GUI login prompt it says "Failed to authenticate" before I enter my password. And actually the password field is greyed out.
PASSWORD BIT SOLVED (for tty): I previously tried & failed to use my yubikey to login to my system, involving adding requirements to pam.d (see here). I've commented those out and now can login to tty. Now to try the display drivers thing.
More updates: purged nvidia drivers, lspci now says the graphics card has no active driver. Still no idea how to actually select the nouveau driver outside of the GUI - it's already installed, and I backed up and removed xorg.conf to prompt it to rebuild that from scratch, still nothing.
Based on this, grep nouveau /var/log/Xorg.0.log:
(II) LoadModule: "nouveau"
(II) Loading /usr/lib64/xorg/modules/drivers/nouveau_drv.so
(II) Module nouveau: vendor="X.Org Foundation"
(==) Matched nouveau as autoconfigured driver 0
(II) LoadModule: "nouveau"
(II) Loading /usr/lib64/xorg/modules/drivers/nouveau_drv.so
(II) Module nouveau: vendor="X.Org Foundation"
(II) UnloadModule: "nouveau"
(II) Unloading nouveau
(II) Failed to load module "nouveau" (already loaded, 0)
It looks like it's trying to load it twice?
lsmod | grep nouveau
Suggests it is loaded.
lspci -nnk | grep -iA2 vga
Should show which driver is in use but the result is:
"grep: vga: No such file or directory".
Completely stumped as to how to get it to use this driver.
sudo lshw -c video
Gives some interesting bits:
*-display UNCLAIMED
configuration: latency=0
I.e. no driver again, and unclaimed, whatever that means.
lspci -nnk | grep -i vga -A3 | grep 'Kernel modules'
nvidiafb, nouveau
More: this says I can bind a module (nouveau) to a device (nvidia gpu) but there's no nvidia gpu in /sys/bus/pci/drivers/.
This has various useful approaches but nothing if there's no driver loaded, other than it's not loaded (comments on answer 1). The user said "When booting via BIOS, X ends up using VESA driver, but when booting via UEFI, X cannot start at all" but IDK how they came to this conclusion.
This says you can blacklist modules but nouveau isn't blacklisted (I checked).
