Salve a tutti ho installato sul mio hd esterno kubuntu 10.10 ma non parte.
Quando avvio kubuntu,metto username e pass esce il riquadro principale dove compare l'icona di un HD,l'icona delle impostazioni e ritorna alla schermata di login.La cosa bella e che quando avviavo live kubuntu le icone nel riquadro principale apparivano tutte(icona hd,icona impostazioni ecc...fino alla grande K[simbolo di kde])
Che faccio?
N.B:Avevo avuto questo problema anche quando avevo installato KDE su ubuntu.
Mi hanno consigliato di accedere con control alt f1 alla schermata di login,dare il comando

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mv .kde kde.old

e vedere se funzionava.Macche.Ancora non funziona,e mi hanno consigliato di andare a leggere il file .xsession errors nella cartella home,e c'e scritto questo dentro:

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Xsession: X session started for ciaox at mer 13 ott 2010, 14.20.12, CEST
Setting IM through im-switch for locale=it_IT.
Start IM through /etc/X11/xinit/xinput.d/all_ALL linked to /etc/X11/xinit/xinput.d/default.
[: 225: ==: unexpected operator
startkde: Starting up...
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
QMetaObject::invokeMethod: No such method KUniqueApplication::loadCommandLineOptionsForNewInstance()
kbuildsycoca4 running...
"KConfigIni: In file /tmp/kde-ciaox/kconf_updateIK1306.tmp, line 1: " Invalid entry (missing '=')
QDBusObjectPath: invalid path ""
Fetched layout groups from X server:    layouts: ("it")    variants: ("")
X Error: BadValue (integer parameter out of range for operation) 2
  Major opcode: 102 (X_ChangeKeyboardControl)
  Resource id:  0xffffffc8
Fetched layout groups from X server:    layouts: ("it")    variants: ("")
QMetaObject::invokeMethod: No such method KUniqueApplication::loadCommandLineOptionsForNewInstance()
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
QMetaObject::invokeMethod: No such method KUniqueApplication::loadCommandLineOptionsForNewInstance()

Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Invalid D-BUS member name 'idle-hint' found in interface 'org.freedesktop.ConsoleKit.Session' while parsing introspection
Invalid D-BUS member name 'is-local' found in interface 'org.freedesktop.ConsoleKit.Session' while parsing introspection
Invalid D-BUS member name 'x11-display-device' found in interface 'org.freedesktop.ConsoleKit.Session' while parsing introspection
Invalid D-BUS member name 'x11-display' found in interface 'org.freedesktop.ConsoleKit.Session' while parsing introspection
Invalid D-BUS member name 'display-device' found in interface 'org.freedesktop.ConsoleKit.Session' while parsing introspection
Invalid D-BUS member name 'remote-host-name' found in interface 'org.freedesktop.ConsoleKit.Session' while parsing introspection
Invalid D-BUS member name 'session-type' found in interface 'org.freedesktop.ConsoleKit.Session' while parsing introspection
Invalid D-BUS member name 'unix-user' found in interface 'org.freedesktop.ConsoleKit.Session' while parsing introspection
kded(1304)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
<unknown program name>(1301)/ KStartupInfo::createNewStartupId: creating:  "Giorgio-Ubuntu-Desktop;1286972416;382597;1301_TIME0" : "unnamed app"
kded(1304)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
QDBusConnection: name 'org.kde.kglobalaccel' had owner '' but we thought it was ':1.11'
QDBusObjectPath: invalid path ""
QObject::connect: Cannot connect (null)::deviceCreated(Device*) to Monolithic::deviceCreated(Device*)
QObject::connect: Cannot connect (null)::deviceDisappeared(Device*) to Monolithic::regenerateDeviceEntries()
QObject::connect: Cannot connect (null)::deviceRemoved(Device*) to Monolithic::regenerateDeviceEntries()
Object::disconnect: Unexpected null parameter
Object::disconnect: Unexpected null parameter
Object::disconnect: Unexpected null parameter
QMetaObject::invokeMethod: No such method KUniqueApplication::loadCommandLineOptionsForNewInstance()
QMetaObject::invokeMethod: No such method KUniqueApplication::loadCommandLineOptionsForNewInstance()
kwin(1496) KWin::CompositingPrefs::detectDriverAndVersion: GL vendor is "VIA Technology"
kwin(1496) KWin::CompositingPrefs::detectDriverAndVersion: GL renderer is "Mesa DRI UniChrome (KM400) 20060710 x86/MMX+/3DNow!+/SSE"
kwin(1496) KWin::CompositingPrefs::detectDriverAndVersion: GL version is "1.2 Mesa 7.9-devel"
kwin(1496) KWin::CompositingPrefs::detectDriverAndVersion: Detected driver "unknown" , version ""
kdeinit4: Fatal IO error: client killed
kdeinit4: sending SIGHUP to children.
klauncher: Exiting on signal 1
bluedevil-monolithic: Fatal IO error: client killed
kglobalaccel: Fatal IO error: client killed
XIO:  fatal IO error 104 (Connection reset by peer) on X server ":0.0"

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Trovate piu' informazioni sulla mia discussione sul forum di ubuntu:
http://forum.ubuntu-it.org/index.php/topic,415709.0.html

Ciao!

scusa il ritardo della risposta. Da quello che ho letto hai risolto...
In sostanza il problema era che durante il caricamento KDE tentava di attivare gli effetti 3D, a quel punto X crashava alla grande e addio... è un bug dei driver VIA (e forse di Ubuntu che utilizza una versione di sviluppo non ancora rilasciata dei driver 3D Mesa).

Diego