KDE가 초기 로드 후 로그인 페이지로 다시 리디렉션되는 이유는 무엇입니까?

Debian Jessie를 새로 설치하고 KDE를 설치하려고 하는데 로그인하여 데스크탑 환경으로 플라즈마를 선택하면 몇 초 동안 플라즈마 부팅 화면으로 갔다가 즉시 일반 로그인 화면으로 돌아갑니다. . 이 문제를 어떻게 해결할 수 있나요? 어디를 볼 것인가?

내 파일의 내용은 .xsession-errors다음과 같습니다.

Xsession: X session started for nathan at Thu Oct 29 00:56:25 MDT 2015
localuser:nathan being added to access control list
Loading stage  "initial" 193
startkde: Starting up...
kdeinit5: preparing to launch 'libkdeinit5_klauncher'
kdeinit5: Launched KLauncher, pid = 950, result = 0
Qt: Session management error: networkIdsList argument is NULL
Connecting to deprecated signal  QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
kdeinit5: opened connection to :1
kdeinit5: preparing to launch 'libkdeinit5_kded5'
kdeinit5: Launched KDED, pid = 952 result = 0
kdeinit5: preparing to launch 'libkdeinit5_kcminit_startup'
kdeinit5: Launched 'kcminit_startup', pid = 953 result = 0
Qt: Session management error: networkIdsList argument is NULL
Recreating ksycoca file ("/home/nathan/.cache  /ksycoca5_en_ABGG1sD7FGwLWpevNW74RXeZhv0=", version 303)
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kdeinit5 path = /usr/bin pid = 952
KCrash: Arguments: /usr/bin/kdeinit5
KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi   from kdeinit
kdeinit5: Got EXEC_NEW '/usr/lib/x86_64-linux-gnu/libexec/drkonqi' from wrapper.
kdeinit5: preparing to launch '/usr/lib/x86_64-linux-gnu/libexec/drkonqi'
kdeinit5: PID 957 terminated.
Menu "applications-kmenuedit.menu" not found.
Saving
kdeinit5: Got SETENV 'KDE_MULTIHEAD=false' from launcher.
Initializing  "kcm_input" :  "kcminit_mouse"
kdeinit5: PID 953 terminated.
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kdeinit5 path = /usr/bin pid = 954
KCrash: Arguments: /usr/bin/kdeinit5
KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi   from kdeinit
kdeinit5: Got EXEC_NEW '/usr/lib/x86_64-linux-gnu/libexec/drkonqi' from   wrapper.
kdeinit5: preparing to launch '/usr/lib/x86_64-linux-gnu/libexec/drkonqi'
kdeinit5: Got KWRAPPER 'ksmserver' from wrapper.
kdeinit5: preparing to launch 'libkdeinit5_ksmserver'
kdeinit5: PID 952 terminated.
kdeinit5: PID 960 terminated.
Qt: Session management error: networkIdsList argument is NULL
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kdeinit5 path = /usr/bin pid = 961
KCrash: Arguments: /usr/bin/kdeinit5
KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi   from kdeinit
kdeinit5: Got EXEC_NEW '/usr/lib/x86_64-linux-gnu/libexec/drkonqi' from   wrapper.
kdeinit5: preparing to launch '/usr/lib/x86_64-linux-gnu/libexec/drkonqi'
kdeinit5: PID 964 terminated.
kdeinit5: PID 961 terminated.
startkde: Shutting down...
kdeinit5: terminate KDE.
klauncher: Exiting on signal 1
startkde: Running shutdown scripts...
startkde: Done.