从 Ubuntu 16.04 升级到 18.04 后，我无法使用 lightdm 界面登录：
我尝试了建议这里（检查权限并重新安装/重新启动 lightdm）但没有变化。
这些是我在日志中能找到的内容：
syslog
Jan 8 15:39:25 penny lightdm[1513]: Failed to write utmpx: Permission denied
Jan 8 15:39:25 penny lightdm[1513]: Error writing to daemon: Bad file descriptor
Jan 8 15:39:25 penny lightdm[1513]: message repeated 2 times: [ Error writing to daemon: Bad file descriptor]
Jan 8 15:39:25 penny lightdm[1513]: Failed to write utmpx: Permission denied
Jan 8 15:39:25 penny gnome-session-c[2880]: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-2E3GCThPiA: Verbindungsaufbau abgelehnt
Jan 8 15:39:30 penny gnome-session[2775]: X Error of failed request: BadValue (integer parameter out of range for operation)
Jan 8 15:39:30 penny gnome-session[2775]: Major opcode of failed request: 154 (GLX)
Jan 8 15:39:30 penny gnome-session[2775]: Minor opcode of failed request: 3 (X_GLXCreateContext)
Jan 8 15:39:30 penny gnome-session[2775]: Value in failed request: 0x0
Jan 8 15:39:30 penny gnome-session[2775]: Serial number of failed request: 19
Jan 8 15:39:30 penny gnome-session[2775]: Current serial number in output stream: 20
Jan 8 15:39:30 penny gnome-session[2775]: gnome-session-check-accelerated: GL Helper exited with code 256
Jan 8 15:39:30 penny gnome-session-c[2882]: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-2E3GCThPiA: Verbindungsaufbau abgelehnt
Jan 8 15:39:30 penny [2882]: eglGetDisplay() failed
Jan 8 15:39:30 penny gnome-session[2775]: gnome-session-check-accelerated: GLES Helper exited with code 256
Jan 8 15:39:30 penny gnome-session-c[2883]: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-2E3GCThPiA: Verbindungsaufbau abgelehnt
Jan 8 15:39:35 penny gnome-session[2775]: X Error of failed request: BadValue (integer parameter out of range for operation)
Jan 8 15:39:35 penny gnome-session[2775]: Major opcode of failed request: 154 (GLX)
Jan 8 15:39:35 penny gnome-session[2775]: Minor opcode of failed request: 3 (X_GLXCreateContext)
Jan 8 15:39:35 penny gnome-session[2775]: Value in failed request: 0x0
Jan 8 15:39:35 penny gnome-session[2775]: Serial number of failed request: 19
Jan 8 15:39:35 penny gnome-session[2775]: Current serial number in output stream: 20
Jan 8 15:39:35 penny gnome-session[2775]: gnome-session-check-accelerated: GL Helper exited with code 256
Jan 8 15:39:35 penny gnome-session-c[2885]: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-2E3GCThPiA: Verbindungsaufbau abgelehnt
Jan 8 15:39:35 penny gnome-session-c[2885]: eglGetDisplay() failed
Jan 8 15:39:35 penny gnome-session[2775]: gnome-session-check-accelerated: GLES Helper exited with code 256
Jan 8 15:39:35 penny gnome-session[2775]: gnome-session-binary[2775]: WARNING: software acceleration check failed: Der Kindprozess wurde mit Status 1 beendet
Jan 8 15:39:35 penny gnome-session[2775]: gnome-session-binary[2775]: CRITICAL: We failed, but the fail whale is dead. Sorry....
Jan 8 15:39:35 penny gnome-session-binary[2775]: WARNING: software acceleration check failed: Der Kindprozess wurde mit Status 1 beendet
Jan 8 15:39:35 penny gnome-session-binary[2775]: CRITICAL: We failed, but the fail whale is dead. Sorry....
Jan 8 15:39:35 penny lightdm[1513]: Failed to write utmpx: Permission denied
Jan 8 15:39:35 penny gnome-session-c[2991]: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-2E3GCThPiA: Verbindungsaufbau abgelehnt
Jan 8 15:39:40 penny gnome-session[2886]: X Error of failed request: BadValue (integer parameter out of range for operation)
Jan 8 15:39:40 penny gnome-session[2886]: Major opcode of failed request: 154 (GLX)
Jan 8 15:39:40 penny gnome-session[2886]: Minor opcode of failed request: 3 (X_GLXCreateContext)
Jan 8 15:39:40 penny gnome-session[2886]: Value in failed request: 0x0
Jan 8 15:39:40 penny gnome-session[2886]: Serial number of failed request: 19
Jan 8 15:39:40 penny gnome-session[2886]: Current serial number in output stream: 20
Jan 8 15:39:40 penny gnome-session[2886]: gnome-session-check-accelerated: GL Helper exited with code 256
Jan 8 15:39:40 penny gnome-session-c[2993]: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-2E3GCThPiA: Verbindungsaufbau abgelehnt
Jan 8 15:39:40 penny gnome-session-c[2993]: eglGetDisplay() failed
Jan 8 15:39:40 penny gnome-session[2886]: gnome-session-check-accelerated: GLES Helper exited with code 256
Jan 8 15:39:40 penny gnome-session-c[2994]: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-2E3GCThPiA: Verbindungsaufbau abgelehnt
Jan 8 15:39:45 penny gnome-session[2886]: X Error of failed request: BadValue (integer parameter out of range for operation)
Jan 8 15:39:45 penny gnome-session[2886]: Major opcode of failed request: 154 (GLX)
Jan 8 15:39:45 penny gnome-session[2886]: Minor opcode of failed request: 3 (X_GLXCreateContext)
Jan 8 15:39:45 penny gnome-session[2886]: Value in failed request: 0x0
Jan 8 15:39:45 penny gnome-session[2886]: Serial number of failed request: 19
Jan 8 15:39:45 penny gnome-session[2886]: Current serial number in output stream: 20
Jan 8 15:39:45 penny gnome-session[2886]: gnome-session-check-accelerated: GL Helper exited with code 256
Jan 8 15:39:45 penny gnome-session-c[2996]: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-2E3GCThPiA: Verbindungsaufbau abgelehnt
Jan 8 15:39:45 penny gnome-session-c[2996]: eglGetDisplay() failed
Jan 8 15:39:45 penny gnome-session[2886]: gnome-session-check-accelerated: GLES Helper exited with code 256
Jan 8 15:39:45 penny gnome-session[2886]: gnome-session-binary[2886]: WARNING: software acceleration check failed: Der Kindprozess wurde mit Status 1 beendet
Jan 8 15:39:45 penny gnome-session[2886]: gnome-session-binary[2886]: CRITICAL: We failed, but the fail whale is dead. Sorry....
Jan 8 15:39:45 penny gnome-session-binary[2886]: WARNING: software acceleration check failed: Der Kindprozess wurde mit Status 1 beendet
Jan 8 15:39:45 penny gnome-session-binary[2886]: CRITICAL: We failed, but the fail whale is dead. Sorry....
dbus.service日志
● dbus.service - D-Bus System Message Bus
Loaded: loaded (/lib/systemd/system/dbus.service; static; vendor preset: enabled)
Active: active (running) since Wed 2020-01-08 15:38:17 CET; 59min ago
Docs: man:dbus-daemon(1)
Main PID: 924 (dbus-daemon)
Tasks: 1 (limit: 4915)
CGroup: /system.slice/dbus.service
└─924 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
Jan 08 15:38:57 penny dbus-daemon[924]: [system] Failed to activate service 'org.bluez': timed out (service_start_timeout=25000ms)
Jan 08 15:39:03 penny dbus-daemon[924]: [system] Connection :1.72 (uid=0 pid=2472 comm="busctl monitor " label="unconfined") became a monitor.
Jan 08 15:39:14 penny dbus-daemon[924]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.78" (uid=1006 pid=2491 comm="lightdm --session-child 12 19 " label="unconfined") interface="org.freedesktop.login1.Manager" member="ReleaseSession" error name="(unset)" requested_reply="0" destination="org.freedesktop.login1" (uid=0 pid=1041 comm="/lib/systemd/systemd-logind " label="unconfined")
Jan 08 15:39:25 penny dbus-daemon[924]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.79" (uid=1006 pid=2490 comm="lightdm --session-child 12 19 " label="unconfined") interface="org.freedesktop.login1.Manager" member="ReleaseSession" error name="(unset)" requested_reply="0" destination="org.freedesktop.login1" (uid=0 pid=1041 comm="/lib/systemd/systemd-logind " label="unconfined")
Jan 08 15:39:35 penny dbus-daemon[924]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.80" (uid=1006 pid=2774 comm="lightdm --session-child 12 19 " label="unconfined") interface="org.freedesktop.login1.Manager" member="ReleaseSession" error name="(unset)" requested_reply="0" destination="org.freedesktop.login1" (uid=0 pid=1041 comm="/lib/systemd/systemd-logind " label="unconfined")
Jan 08 15:39:47 penny dbus-daemon[924]: [system] Activating via systemd: service name='org.freedesktop.timedate1' unit='dbus-org.freedesktop.timedate1.service' requested by ':1.97' (uid=112 pid=3081 comm="/usr/lib/x86_64-linux-gnu/indicator-datetime/indic" label="unconfined")
Jan 08 15:39:47 penny dbus-daemon[924]: [system] Successfully activated service 'org.freedesktop.timedate1'
Jan 08 15:39:47 penny dbus-daemon[924]: [system] Activating via systemd: service name='org.bluez' unit='dbus-org.bluez.service' requested by ':1.118' (uid=112 pid=3114 comm="/usr/bin/pulseaudio --start --log-target=syslog " label="unconfined")
Jan 08 15:39:53 penny dbus-daemon[924]: [system] Monitoring connection :1.72 closed.
Jan 08 15:40:12 penny dbus-daemon[924]: [system] Failed to activate service 'org.bluez': timed out (service_start_timeout=25000ms)
- 输出
busctl monitor
‣ Type=error Endian=l Flags=1 Version=1 Priority=0 Cookie=3 ReplyCookie=2
Sender=org.freedesktop.DBus Destination=:1.78
ErrorName=org.freedesktop.DBus.Error.AccessDenied ErrorMessage="Rejected send message, 2 matched rules; type="method_call", sender=":1.78" (uid=1006 pid=2491 comm="lightdm --session-child 12 19 " label="unconfined") interface="org.freedesktop.login1.Manager" member="ReleaseSession" error name="(unset)" requested_reply="0" destination="org.freedesktop.login1" (uid=0 pid=1041 comm="/lib/systemd/systemd-logind " label="unconfined")"
MESSAGE "s" {
STRING "Rejected send message, 2 matched rules; type="method_call", sender=":1.78" (uid=1006 pid=2491 comm="lightdm --session-child 12 19 " label="unconfined") interface="org.freedesktop.login1.Manager" member="ReleaseSession" error name="(unset)" requested_reply="0" destination="org.freedesktop.login1" (uid=0 pid=1041 comm="/lib/systemd/systemd-logind " label="unconfined")";
};
有人知道这该如何修复吗？
更新：
我通过重新安装 ubuntu 而不删除主文件夹“修复”了该问题。但这可能不是适合所有人的解决方案。