我有一个与此类似的问题：Debian 使用正确密码登录失败。事实上，当我启动计算机时，GDM 要求我输入密码，我必须多次输入密码（连续三到四次）才能访问我的会话。
为什么 GDM 不直接登录我？是不是配置有问题？
这是我的/var/log/auth.log：
Oct 8 08:17:29 my_desktop polkitd(authority=local): Registered Authentication Agent for unix-session:c3 (system bus name :1.31 [/usr/bin/gnome-shell], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
Oct 8 08:17:41 my_desktop gdm-password]: pam_unix(gdm-password:auth): authentication failure; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=pierre
Oct 8 08:17:41 my_desktop gdm-password]: pam_sss(gdm-password:auth): authentication success; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=pierre
Oct 8 08:17:41 my_desktop gdm-password]: pam_unix(gdm-password:session): session opened for user pierre by (uid=0)
Oct 8 08:17:41 my_desktop systemd-logind[760]: New session 5 of user pierre.
Oct 8 08:17:41 my_desktop systemd: pam_unix(systemd-user:session): session opened for user pierre by (uid=0)
Oct 8 08:17:42 my_desktop gdm-password]: pam_unix(gdm-password:session): session closed for user pierre
Oct 8 08:17:49 my_desktop gdm-password]: pam_unix(gdm-password:auth): authentication failure; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=pierre
Oct 8 08:17:49 my_desktop gdm-password]: pam_sss(gdm-password:auth): authentication success; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=pierre
Oct 8 08:17:49 my_desktop gdm-password]: pam_unix(gdm-password:session): session opened for user pierre by (uid=0)
Oct 8 08:17:49 my_desktop systemd-logind[760]: New session 7 of user pierre.
Oct 8 08:17:50 my_desktop gdm-password]: pam_unix(gdm-password:session): session closed for user pierre
Oct 8 08:17:56 my_desktop gdm-password]: pam_unix(gdm-password:auth): authentication failure; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=pierre
Oct 8 08:17:56 my_desktop gdm-password]: pam_sss(gdm-password:auth): authentication success; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=pierre
Oct 8 08:17:56 my_desktop gdm-password]: pam_unix(gdm-password:session): session opened for user pierre by (uid=0)
Oct 8 08:17:56 my_desktop systemd-logind[760]: New session 8 of user pierre.
Oct 8 08:17:57 my_desktop gdm-password]: pam_unix(gdm-password:session): session closed for user pierre
Oct 8 08:18:01 my_desktop CRON[2257]: pam_unix(cron:session): session opened for user root by (uid=0)
Oct 8 08:18:01 my_desktop CRON[2258]: pam_unix(cron:session): session opened for user root by (uid=0)
Oct 8 08:18:01 my_desktop CRON[2258]: pam_unix(cron:session): session closed for user root
Oct 8 08:18:02 my_desktop CRON[2257]: pam_unix(cron:session): session closed for user root
Oct 8 08:18:06 my_desktop gdm-password]: pam_unix(gdm-password:auth): authentication failure; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=pierre
Oct 8 08:18:06 my_desktop gdm-password]: pam_sss(gdm-password:auth): authentication success; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rhost= user=pierre
Oct 8 08:18:06 my_desktop gdm-password]: pam_unix(gdm-password:session): session opened for user pierre by (uid=0)
Oct 8 08:18:06 my_desktop systemd-logind[760]: New session 11 of user pierre.
Oct 8 08:18:08 my_desktop gnome-keyring-daemon[2858]: failed to unlock login keyring on startup
Oct 8 08:18:16 my_desktop polkitd(authority=local): Registered Authentication Agent for unix-session:11 (system bus name :1.93 [/usr/bin/gnome-shell], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
Oct 8 08:18:23 my_desktop gnome-keyring-daemon[2858]: asked to register item /org/freedesktop/secrets/collection/Unprotected/1, but it's already registered
Oct 8 08:18:23 my_desktop gnome-keyring-daemon[2858]: asked to register item /org/freedesktop/secrets/collection/Unprotected/1, but it's already registered
Oct 8 08:19:01 my_desktop CRON[3835]: pam_unix(cron:session): session opened for user root by (uid=0)
Oct 8 08:19:01 my_desktop CRON[3836]: pam_unix(cron:session): session opened for user root by (uid=0)
Oct 8 08:19:01 my_desktop CRON[3836]: pam_unix(cron:session): session closed for user root
Oct 8 08:19:02 my_desktop CRON[3835]: pam_unix(cron:session): session closed for user root
Oct 8 08:19:41 my_desktop systemd-logind[760]: Removed session 5.
Oct 8 08:19:50 my_desktop systemd-logind[760]: Removed session 7.
Oct 8 08:19:57 my_desktop systemd-logind[760]: Removed session 8.
Oct 8 08:20:01 my_desktop CRON[4605]: pam_unix(cron:session): session opened for user smmsp by (uid=0)
Oct 8 08:20:01 my_desktop CRON[4606]: pam_unix(cron:session): session opened for user root by (uid=0)
Oct 8 08:20:01 my_desktop CRON[4607]: pam_unix(cron:session): session opened for user root by (uid=0)
Oct 8 08:20:01 my_desktop CRON[4607]: pam_unix(cron:session): session closed for user root
Oct 8 08:20:01 my_desktop CRON[4605]: pam_unix(cron:session): session closed for user smmsp
Oct 8 08:20:02 my_desktop CRON[4606]: pam_unix(cron:session): session closed for user root
我的桌面环境是 Gnome 3，我使用的是 Debian 9：
> uname -v
#1 SMP Debian 4.9.144-3.1 (2019-02-19)
编辑：这是结果journalctl -b：
Oct 17 08:51:44 my_desktop /usr/lib/gdm3/gdm-x-session[2182]: (EE)
Oct 17 08:51:44 my_desktop /usr/lib/gdm3/gdm-x-session[2182]: Fatal server error:
Oct 17 08:51:44 my_desktop /usr/lib/gdm3/gdm-x-session[2182]: (EE) Cannot open log file "/home/pierre/.local/share/xorg/Xorg.pid-2184.log"
Oct 17 08:51:44 my_desktop /usr/lib/gdm3/gdm-x-session[2182]: (EE)
Oct 17 08:51:44 my_desktop /usr/lib/gdm3/gdm-x-session[2182]: Please consult the The X.Org Foundation support
Oct 17 08:51:44 my_desktop /usr/lib/gdm3/gdm-x-session[2182]: at http://wiki.x.org
Oct 17 08:51:44 my_desktop /usr/lib/gdm3/gdm-x-session[2182]: for help.
Oct 17 08:51:44 my_desktop /usr/lib/gdm3/gdm-x-session[2182]: (EE)
Oct 17 08:51:44 my_desktop /usr/lib/gdm3/gdm-x-session[2182]: Unable to run X server
Oct 17 08:51:52 my_desktop /usr/lib/gdm3/gdm-x-session[2213]: (EE)
Oct 17 08:51:52 my_desktop /usr/lib/gdm3/gdm-x-session[2213]: Fatal server error:
Oct 17 08:51:52 my_desktop /usr/lib/gdm3/gdm-x-session[2213]: (EE) Cannot open log file "/home/pierre/.local/share/xorg/Xorg.pid-2215.log"
Oct 17 08:51:52 my_desktop /usr/lib/gdm3/gdm-x-session[2213]: (EE)
Oct 17 08:51:52 my_desktop /usr/lib/gdm3/gdm-x-session[2213]: Please consult the The X.Org Foundation support
Oct 17 08:51:52 my_desktop /usr/lib/gdm3/gdm-x-session[2213]: at http://wiki.x.org
Oct 17 08:51:52 my_desktop /usr/lib/gdm3/gdm-x-session[2213]: for help.
Oct 17 08:51:52 my_desktop /usr/lib/gdm3/gdm-x-session[2213]: (EE)
Oct 17 08:51:52 my_desktop /usr/lib/gdm3/gdm-x-session[2213]: Unable to run X server
Oct 17 08:51:59 my_desktop /usr/lib/gdm3/gdm-x-session[2241]: (EE)
Oct 17 08:51:59 my_desktop /usr/lib/gdm3/gdm-x-session[2241]: Fatal server error:
Oct 17 08:51:59 my_desktop /usr/lib/gdm3/gdm-x-session[2241]: (EE) Cannot open log file "/home/pierre/.local/share/xorg/Xorg.pid-2243.log"
Oct 17 08:51:59 my_desktop /usr/lib/gdm3/gdm-x-session[2241]: (EE)
Oct 17 08:51:59 my_desktop /usr/lib/gdm3/gdm-x-session[2241]: Please consult the The X.Org Foundation support
Oct 17 08:51:59 my_desktop /usr/lib/gdm3/gdm-x-session[2241]: at http://wiki.x.org
Oct 17 08:51:59 my_desktop /usr/lib/gdm3/gdm-x-session[2241]: for help.
Oct 17 08:51:59 my_desktop /usr/lib/gdm3/gdm-x-session[2241]: (EE)
Oct 17 08:51:59 my_desktop /usr/lib/gdm3/gdm-x-session[2241]: Unable to run X server
但是，我有权在该目录中写入：
> ll /home/pierre/.local/share/xorg/
total 20
drwxr-xr-x 2 pierre users 4 Oct 17 08:52 ./
drwx------ 27 pierre users 32 Oct 17 14:38 ../
-rw-r--r-- 1 pierre users 26361 Oct 17 08:52 Xorg.1.log
-rw-r--r-- 1 pierre users 27654 Oct 16 17:56 Xorg.1.log.old
编辑2： 我仍然坚持我的问题。也许 Xorg 的日志会更有用：https://pastebin.com/raw/05iTLdfm