I believe the reason is here:
/etc/X11/Xsession.d/40guidance-displayconfig_restore: 11: /usr/bin
/displayconfig-restore: not found
you removed kde-guidance but it didn't remove the Xsession file.
** Changed in: kde-guidance (Ubuntu)
Sourcepackagename: xorg => kde-guidance
Status: Incomplete => Confirmed
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Xsession becomes zombie after login
https://bugs.launchpad.net/bugs/173515
You received this bug notification because you are a member of Kubuntu
Team, which is a bug contact for kde-guidance in ubuntu.
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