起動時に下線が点滅し、画面が点滅します。

その後、aptitude safe-upgrade私のラップトップは起動を停止しました。

録音しました。この動画起動プロセス。

tty1にアクセスでき、そこからstartx問題なく実行できます。出力は次のとおりです。

X.Org X Server 1.17.2
Release Date: 2015-06-16
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.1.0 x86_64 Debian
Current Operating System: Linux debian 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1 (2015-05-24) x86_64
Kernel command line: BOOT_IMAGE=/vmlinuz-3.16.0-4-amd64 root=/dev/mapper/debian--vg-root ro quiet
Build Date: 11 August 2015  10:51:15AM
xorg-server 2:1.17.2-1.1 (http://www.debian.org/support)
Current version of pixman: 0.32.6
   Before reporting problems, check http://wiki.x.org
   to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
   (++) from command line, (!!) notice, (II) informational,
   (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.2.log", Time: Fri Aug 28 15:55:04 2015
(==) Using system config directory "/usr/share/X11/xorg.conf.d"

DMに問題があると思います。/var/lightdm/lightdm.log出力は次のとおりです。

[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.14.2, UID=0 PID=1275
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/01_debian.conf
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: Registered seat module xlocal
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Registered seat module unity
[+0.01s] DEBUG: Monitoring logind for seats
[+0.01s] DEBUG: New seat added from logind: seat0
[+0.01s] DEBUG: Loading properties from config section SeatDefaults
[+0.01s] DEBUG: Seat seat0: Starting
[+0.01s] DEBUG: Seat seat0: Creating greeter session
[+0.01s] DEBUG: Seat seat0: Creating display server of type x
[+0.01s] DEBUG: Could not run plymouth --ping: Failed to execute child process "plymouth" (No such file or directory)
[+0.01s] DEBUG: Using VT 7
[+0.01s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.01s] DEBUG: DisplayServer x-0: Logging to /var/log/lightdm/x-0.log
[+0.01s] DEBUG: DisplayServer x-0: Writing X server authority to /var/run/lightdm/root/:0
[+0.01s] DEBUG: DisplayServer x-0: Launching X Server
[+0.01s] DEBUG: Launching process 1280: /usr/bin/X :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.01s] DEBUG: DisplayServer x-0: Waiting for ready signal from X server :0
[+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.01s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.01s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.02s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+0.35s] DEBUG: Got signal 10 from process 1280
[+0.35s] DEBUG: DisplayServer x-0: Got signal from X server :0
[+0.35s] DEBUG: DisplayServer x-0: Connecting to XServer :0
[+0.35s] DEBUG: Seat seat0: Display server ready, starting session authentication
[+0.35s] DEBUG: Session pid=1291: Started with service 'lightdm-greeter', username 'lightdm'
[+0.37s] DEBUG: Session pid=1291: Authentication complete with return value 0: Success
[+0.37s] DEBUG: Seat seat0: Session authenticated, running command
[+0.37s] DEBUG: Session pid=1291: Running command /usr/sbin/lightdm-gtk-greeter
[+0.37s] DEBUG: Creating shared data directory /var/lib/lightdm/data/lightdm
[+0.37s] DEBUG: Session pid=1291: Logging to /var/log/lightdm/x-0-greeter.log
[+0.42s] DEBUG: Activating VT 7
[+0.42s] DEBUG: Activating login1 session c7
[+0.42s] DEBUG: Seat seat0 changes active session to c7
[+0.42s] DEBUG: Session c7 is already active
[+0.50s] DEBUG: Session pid=1291: Greeter closed communication channel
[+0.50s] DEBUG: Session pid=1291: Exited with return value 0
[+0.50s] DEBUG: Seat seat0: Session stopped
[+0.50s] DEBUG: Seat seat0: Stopping; failed to start a greeter
[+0.50s] DEBUG: Seat seat0: Stopping
[+0.50s] DEBUG: Seat seat0: Stopping display server
[+0.50s] DEBUG: Sending signal 15 to process 1280
[+0.51s] DEBUG: Seat seat0 changes active session to
[+0.51s] CRITICAL: session_get_login1_session_id: assertion 'session != NULL' failed
[+1.52s] DEBUG: Process 1280 exited with return value 0
[+1.52s] DEBUG: DisplayServer x-0: X server stopped
[+1.52s] DEBUG: Releasing VT 7
[+1.52s] DEBUG: DisplayServer x-0: Removing X server authority /var/run/lightdm/root/:0
[+1.52s] DEBUG: Seat seat0: Display server stopped
[+1.52s] DEBUG: Seat seat0: Stopped
[+1.52s] DEBUG: Required seat has stopped
[+1.52s] DEBUG: Stopping display manager
[+1.52s] DEBUG: Display manager stopped
[+1.52s] DEBUG: Stopping daemon
[+1.52s] DEBUG: Exiting with return value 1

以下の行をご覧になりますか？

[+0.51s] CRITICAL: session_get_login1_session_id: assertion 'session != NULL' failed

MateはLightdmを使用しているので、アンインストールして再インストールしましたが、違いはありませんでした。その後、lxdmを使用するXLDEをインストールしました。同じ問題が再び発生します。画面の点滅とカーソルの点滅。

x を手動で起動できるため、これは X とは関係がなく、Mate と LXDE の両方で同じ問題があるため、デスクトップ環境とは関係ありません。

この問題を解決し始めるべき提案がある人はいますか？