Start up with farily slow, then file manager won't open, and nothing thunar related will work.

I get the error message when i try to shut down my PC through GUI.

"GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs:Type of message, "(yb)", does not match expected type"(b)"

However, if i use

pkill thunar

It works fine flawlessly.

Thunar bug? Should i report to Xfce or Ubuntu?

  • You can try to ask here first xfce-forum – ctac_ Dec 27 '20 at 17:49
  • @ctac_thanks already filed a bug – John Dale Dec 27 '20 at 21:48

Can you please try to clear the session cache, like proposed here ?

open Settings Manager -> Session and Startup -> Session -> Clear saved sessions

Or more direct: rm -rf ~/.cache/sessions

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