Cant login in to system

[QkiZ]

I'm on login screen, GDM3. I'm choosing my user and typing password. After pressing enter key for confirm password screen is blinking once and I'm on GDM login screen once again.
I found this in syslog:

gnome-shell[6209]: The XKEYBOARD keymap compiler (xkbcomp) reports:
gnome-shell[6209]: > Warning: Unsupported maximum keycode 569, clipping.
gnome-shell[6209]: > X11 cannot support keycodes above 255.
gnome-shell[6209]: > Internal error: Could not resolve keysym Invalid
gnome-shell[6209]: Errors from xkbcomp are not fatal to the X server

Installed GDM version is 3.34.1-1ubuntu1. System wasn't updated since last reboot. After installing SDDM I can log in to system.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gdm3 3.34.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Aug 10 10:20:33 2020
InstallationDate: Installed on 2019-03-01 (527 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pl_PL.UTF-8
 SHELL=/usr/bin/fish
SourcePackage: gdm3
UpgradeStatus: Upgraded to focal on 2020-05-15 (86 days ago)
modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2019-03-06T11:01:56.985551

[Daniel van Vugt (vanvugt)]

Please:

1. Try selecting 'Ubuntu on Wayland' on the login screen, before entering your password.

and if that didn't work then:

2. Try editing /etc/gdm3/custom.conf and uncommenting:

   #WaylandEnable=false

   to be:

   WaylandEnable=false

   and reboot.

[QkiZ (qkiz)]

1. I tried this before I made a bug report. It just hang on purple screen right after confirming password. I needed to kill X session to return to login screen. Doesn't work.
2. Doesn't work also. Symptoms are same but log is different.
https://paste.ubuntu.com/p/gjqXkFGyqP/

[Daniel van Vugt (vanvugt)]

I would like to see a clean log of the problem in action. Please reboot fresh, reproduce the gdm login failure and then reboot _again_.

Now after the second reboot please hit Ctrl+Alt+F4 and log in to the text console. In the text console please run:

  journalctl -b-1 > prevboot.txt

and then attach the resulting text file here.

[QkiZ (qkiz)]

Here's log from previous boot like you wanted.
https://paste.ubuntu.com/p/T5bWDQXr76/

[Daniel van Vugt (vanvugt)]

These look like the problem:

sie 12 09:43:03 mkukielka-prs gdm-password][3167]: pam_unix(gdm-password:session): session closed for user mkukielka

sie 12 09:43:03 mkukielka-prs systemd-logind[1446]: Session 2 logged out. Waiting for processes to exit.
sie 12 09:43:04 mkukielka-prs systemd-logind[1446]: Removed session 2.

Although they don't explain the "why".

Please enable debug mode in /etc/gdm3/custom.conf and then repeat the steps from comment #4.

[QkiZ (qkiz)]

Debug mode enabled, steps repeated.
https://paste.ubuntu.com/p/f97M7NgWF4/

[Daniel van Vugt (vanvugt)]

Thanks.

It sounds like there's an invalid Xorg config file on your system with lots of:

  Option "_source" "server/udev"

and

  Option "_source" "_driver/libinput"

That may be why Xorg is exiting immediately. If you can find the config file that contains those then please move it elsewhere, and/or attach it here.

[Daniel van Vugt (vanvugt)]

Try looking in /usr/share/X11/xorg.conf.d/

[QkiZ (qkiz)]

Files from /usr/share/X11/xorg.conf.d in attachment. None of these files contains 'Option "_source" "server/udev"' or 'Option "_source" "_driver/libinput"'.

[QkiZ (qkiz)]

I didn't modify those files. Those files belongs to following packages:
xserver-xorg-video-amdgpu
xserver-xorg-core
xserver-xorg-video-radeon
xserver-xorg-input-libinput
xserver-xorg-input-wacom

[Daniel van Vugt (vanvugt)]

This looks like the exact point of failure:

sie 13 11:38:35 mkukielka-prs /usr/lib/gdm3/gdm-x-session[3413]: unix_listener: cannot bind to path /tmp/ssh-eND2ca8O3cXt/agent.3413: Permission denied
sie 13 11:38:35 mkukielka-prs gdm-x-session[3385]: session exited with status 1
sie 13 11:38:35 mkukielka-prs /usr/lib/gdm3/gdm-x-session[3492]: X connection to :1 broken (explicit kill or server shutdown).

Perhaps some kind of SSH misconfiguration? If you are not using SSH for the moment then try moving ~/.ssh to a different name briefly. Or try logging in as a different user with a fresh home directory.

[QkiZ (qkiz)]

Still nothing.
https://paste.ubuntu.com/p/q8NKNMh4KX/
I renamed ~/.ssh to ~/.ssh.bak, switched back to gdm3, reboot and it's same. Still after confirming password I'm landing on gdm login screen.

[QkiZ (qkiz)]

I switched to sddm and log in to system to check permissions on ssh agent socket.

$ ls -la /tmp/ssh-GLokEJp0ajlD/agent.4700
srw------- 1 mkukielka mkukielka 0 sie 18 12:26 /tmp/ssh-GLokEJp0ajlD/agent.4700=
I think the permissions are good.

[QkiZ (qkiz)]

I found what causes this issue. I set up umask to 137 in .profile file. After commenting out this line and restart I can log in to system.

[QkiZ (qkiz)]

Anyway it is stupid that setting custom umask blows gdm and prevent logging in.

[Daniel van Vugt (vanvugt)]

Yes and no. Computers will do what you ask them to, not what you want them to.