что-то я поторопился на счет отсутствия логов
kcm_input: Using X11 backend
startkde: Starting up...
kdeinit5: preparing to launch '/usr/lib/x86_64-linux-gnu/libexec/kf5/klauncher'
kdeinit5: Launched KLauncher, pid = 5346, result = 0
Waiting for already running klauncher to exit.
Waiting for already running klauncher to exit.
Another instance of klauncher is already running!
kdeinit5: Communication error with launcher. Exiting!
kdeinit5_wrapper: Warning: connect(/run/user/1000/kdeinit5__0) failed: : Connection refused
Qt: Session management error: networkIdsList argument is NULL
Configuring Lock Action
ksmserver: "/run/user/1000/KSMserver"
ksmserver: KSMServer: SetAProc_loc: conn 0 , prot= local , file= @/tmp/.ICE-unix/5350
ksmserver: KSMServer: SetAProc_loc: conn 1 , prot= unix , file= /tmp/.ICE-unix/5350
ksmserver: KSMServer::restoreSession "saved at previous logout"
startkde: Shutting down...
kdeinit5_wrapper: Warning: connect(/run/user/1000/kdeinit5__0) failed: : Connection refused
Error: Can not contact kdeinit5!
startkde: Done.
Qt: Session management error: Could not open network socket
The X11 connection broke: I/O error (code 1)
XIO: fatal IO error 2 (Нет такого файла или каталога) on X server ":0"
after 199 requests (199 known processed) with 0 events remaining.