Am 28.08.2017 um 09:21 schrieb Florian Wicke - Hetzner Online GmbH:
unfortunately KDE5 is not supported by the current nx version: https://wiki.x2go.org/doku.php/doc:de-compat
This page has been updated on 2017-08-13 to say ---8<------8<------8<------8<------8<--- KDE 5: We have received several reports that KDE 5 now works with X2Go, even though it takes a long time to initialize the session. If you're interested in running KDE 5 via X2Go and run into issues, please join the X2Go-User Mailing List or, if you are certain you've found a bug, subscribe to X2Go-Dev and file a bug report. ---8<------8<------8<------8<------8<---
So it's not like KDE5 isn't supported at all - it's just that we don't fully understand (yet) why it suddenly started to work "on its own", without anyone of us making any conscious code change in the stable tree that could have caused this - and, of course, startup times of KDE5 via X2Go are slow, as described above.
-Stefan
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