Я только что обновил Kubuntu до 15.04. Когда я добираюсь до графического экрана входа в систему SDDM, после того, как мой пароль принят, я получаю заставку KDE с индикатором загрузки, затем он отключается примерно на 75% (показывая "Начиная с версии 219", я понимаю, что это отдельный проблема и может быть связано с моими драйверами Nvidia) и снова выводит меня обратно на экран входа в систему. Я могу войти, если я выберу, например, LXDE или Openbox в качестве DE, но не KDE или Gnome.

Я попробовал это:

sudo apt-get install gdm (select sddm in the configuration dialog)
sudo dpkg-reconfigure gdm (and select sddm again)
sudo apt-get remove gdm

Я попытался sudo systemctl enable sddm.service -f

Я пробовал rm .cache/upstart -rf

Я попытался apt-get install upstart-sysv чтобы заменить systemd.

Вот мои ~/.xsession-ошибки от неудачного запуска KDE. Возможно, важная строка такова:

Qt: Session management error: networkIdsList argument is NULL

А вот и хвост

kscreen.kded: Config KScreen::Config(0xa514e0) is ready
kscreen.kded: Applying config
kscreen.kded: Calculating config ID for KScreen::Config(0xa514e0)
kscreen.kded: Part of the Id: "8081cf91009d8f3909800987c52a390b"
kscreen.kded: Config ID: "f94dcacbcbba492827e2007607e85a6a"
kscreen.kded: Applying ideal config
kscreen.kded: "DP1" Disabled
kscreen.kded: "DP2" Disabled
kscreen.kded: "DP3" Disabled
kscreen.kded: "HDMI1" Disabled
kscreen.kded: "HDMI2" Disabled
kscreen.kded: "HDMI3" Disabled
kscreen.kded: "VGA1" Disabled
kscreen.kded: "VIRTUAL1" Disabled
kscreen.kded: "DP-0" Disabled
kscreen.kded: "DP-1" Disabled
kscreen.kded: Connected outputs: 1
kscreen.kded: doApplyConfig()
QXcbConnection: Could not connect to display :0
QXcbConnection: Could not connect to display :0                  <-- SEE HERE
kwin_x11: FATAL ERROR while trying to open display :0
QXcbConnection: Could not connect to display :0
kdeinit5: PID 8009 terminated.
kdeinit5: PID 8008 terminated.
kdeinit5: PID 8010 terminated.
QXcbConnection: Failed to get the primary output of the screen
The X11 connection broke (error 1). Did the X11 server die?
QXcbConnection: Failed to get the primary output of the screen
The X11 connection broke (error 1). Did the X11 server die?
QXcbConnection: Failed to get the primary output of the screen
The X11 connection broke (error 1). Did the X11 server die?
kdeinit5: Fatal IO error: client killed
kdeinit5: sending SIGHUP to children.
klauncher: Exiting on signal 1
kdeinit5: sending SIGTERM to children.
kdeinit5: Exit.
QXcbConnection: Failed to get the primary output of the screen
The X11 connection broke (error 1). Did the X11 server die?
Unexpected response from KInit (response = 0).
startkde: Could not start ksmserver. Check your installation.
Error: Can't open display: :0
Could not connect to D-Bus server: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /tmp/dbus-TcpGYkEBgY: Connection refused
startkde: Shutting down...
kdeinit5_wrapper: Warning: connect(/run/user/1000/kdeinit5__0) failed: : No such file or directory
Error: Can not contact kdeinit5!
startkde: Running shutdown scripts...
xprop: unable to open display ':0'
xprop: unable to open display ':0'
startkde: Done.
KCrash: Attempting to start /usr/bin/kdeinit5 from kdeinit
Warning: connect() failed: : No such file or directory
KCrash: Attempting to start /usr/bin/kdeinit5 directly

Есть идеи, что происходит? Благодарю.

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