@patrick. others have run into the same problem. similar fix as mentioned above by @xXXXx. i guess kde is trying to “restore the previous desktop session.” setting it to a new session fixes the problem.
https://www.linux.com/forums/ubuntu/kubuntu-1110-kde-sudo-error-every-start-here-fix-it
this fixed it for me as well. sdwdate-gui is running as well. so, in summary, here is the fix:
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go to “system settings → startup and shutdown → desktop session.”
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in the “on login” section, change it from “restore previous session” to “start with an empty session.”
a bit more on session management:
https://docs.kde.org/trunk5/en/kde-workspace/kcontrol/kcmsmserver/
i’d think that starting from an empty session, rather than saved application states at shutdown, is preferable for whonix anyways. or is there something i’m not considering? in whonix 13, the default option selected on install is “start with an empty session.”