Depois de fazer algumas atualizações de software, notei um problema irritante muito muito . Às vezes, vou bloquear meu computador, fazer coisas, voltar e tentar desbloqueá-lo. Sou solicitado pela minha senha. Eu digito minha senha, pressiono Enter e, em seguida, a tela fica preta por alguns segundos, seguida por mim retornando a um prompt de login. Eu digito minha senha e, em seguida, estou logado.
Eu verifiquei os logs do lightdm, e é isso que o lightdm registra quando o evento ocorre.
[+14359.35s] DEBUG: Continue authentication
[+14359.35s] DEBUG: Session pid=17097: Authentication complete with return value 0: Success
[+14359.35s] DEBUG: Authenticate result for user the-computer-geek: Success
[+14359.35s] DEBUG: User the-computer-geek authorized
[+14359.36s] DEBUG: Greeter sets language en_US
[+14359.41s] DEBUG: Greeter requests session xubuntu
[+14359.41s] DEBUG: Seat seat0: Returning to existing user session the-computer-geek
[+14359.41s] DEBUG: Unlocking login1 session c2
[+14359.41s] DEBUG: Activating VT 7
[+14359.54s] DEBUG: Seat seat0: Stopping greeter
[+14359.54s] DEBUG: Session pid=17022: Sending SIGTERM
[+14359.54s] DEBUG: Activating login1 session c2
[+14359.55s] DEBUG: Session pid=17097: Exited with return value 0
[+14359.55s] DEBUG: Seat seat0: Session stopped
[+14359.55s] DEBUG: Seat seat0 changes active session to c2
[+14359.55s] DEBUG: Session c2 is already active
[+14359.55s] DEBUG: Session pid=17022: Exited with return value 0
[+14359.55s] DEBUG: Seat seat0: Session stopped
[+14359.55s] DEBUG: Seat seat0: Stopping display server, no sessions require it
[+14359.55s] DEBUG: Sending signal 15 to process 17009
[+14359.62s] DEBUG: Process 17009 exited with return value 0
[+14359.62s] DEBUG: DisplayServer x-1: X server stopped
[+14359.62s] DEBUG: Releasing VT 8
[+14359.62s] DEBUG: DisplayServer x-1: Removing X server authority /var/run/lightdm/root/:1
[+14359.62s] DEBUG: Seat seat0: Display server stopped
[+14359.64s] DEBUG: Process 1329 terminated with signal 6
[+14359.64s] DEBUG: DisplayServer x-0: X server stopped
[+14359.64s] DEBUG: Releasing VT 7
[+14359.64s] DEBUG: DisplayServer x-0: Removing X server authority /var/run/lightdm/root/:0
[+14359.64s] DEBUG: Seat seat0: Display server stopped
[+14359.64s] DEBUG: Seat seat0: Stopping session
[+14359.64s] DEBUG: Session pid=1779: Sending SIGTERM
[+14359.64s] DEBUG: Seat seat0: Active display server stopped, starting greeter
[+14359.64s] DEBUG: Seat seat0: Creating greeter session
[+14359.64s] DEBUG: Seat seat0: Creating display server of type x
[+14359.64s] DEBUG: Using VT 7
[+14359.64s] DEBUG: Seat seat0: Starting local X display on VT 7
[+14359.64s] DEBUG: DisplayServer x-0: Logging to /var/log/lightdm/x-0.log
[+14359.64s] DEBUG: DisplayServer x-0: Writing X server authority to /var/run/lightdm/root/:0
[+14359.64s] DEBUG: DisplayServer x-0: Launching X Server
[+14359.64s] DEBUG: Launching process 20122: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+14359.64s] DEBUG: DisplayServer x-0: Waiting for ready signal from X server :0
[+14360.23s] DEBUG: Got signal 10 from process 20122
[+14360.23s] DEBUG: DisplayServer x-0: Got signal from X server :0
[+14360.23s] DEBUG: DisplayServer x-0: Connecting to XServer :0
[+14360.23s] DEBUG: Seat seat0: Display server ready, starting session authentication
[+14360.23s] DEBUG: Session pid=20269: Started with service 'lightdm-greeter', username 'lightdm'
[+14360.24s] DEBUG: Session pid=20269: Authentication complete with return value 0: Success
[+14360.24s] DEBUG: Seat seat0: Session authenticated, running command
[+14360.24s] DEBUG: Session pid=20269: Running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/lightdm-gtk-greeter
[+14360.24s] DEBUG: Creating shared data directory /var/lib/lightdm-data/lightdm
[+14360.24s] DEBUG: Session pid=20269: Logging to /var/log/lightdm/seat0-greeter.log
[+14360.26s] DEBUG: Activating VT 7
[+14360.26s] DEBUG: Locking login1 session c2
[+14360.26s] DEBUG: Activating login1 session c5
[+14360.26s] DEBUG: Seat seat0 changes active session to c5
[+14360.26s] DEBUG: Session c5 is already active
[+14360.33s] DEBUG: Greeter connected version=1.18.3 resettable=false
[+14360.40s] DEBUG: Session pid=1779: Exited with return value 0
[+14360.40s] DEBUG: Seat seat0: Session stopped
[+14360.40s] DEBUG: Seat seat0: Stopping display server, no sessions require it
[+14360.47s] DEBUG: Greeter start authentication for the-computer-geek
[+14360.47s] DEBUG: Session pid=20343: Started with service 'lightdm', username 'the-computer-geek'
[+14360.48s] DEBUG: Session pid=20343: Got 1 message(s) from PAM
[+14360.48s] DEBUG: Prompt greeter with 1 message(s)
Por que o lightdm está falhando? O que posso fazer para parar de bater?
Obrigado.
EDIT: Este é um problema esporádico. Isso acontece principalmente quando deixo o sistema sozinho por um período de tempo superior a 20 minutos.