Help! How do I get the File-Edit-View....Help menu back

[Wolfgang Engelmann]

Am 28.02.22 um 19:17 schrieb Wolfgang Engelmann:
>>>
>>> These two lines are missing in my notebook Debian.
>>> There must be something fundamentally wrong.
>>
>> Maybe the display manager. (Is it unity?) If yes, look for the panel 
>> on top of the screen.
>> I had this problem with unity at least.
>>
>>     Kornel

my is on the notebook sddm, on the PC Mint lightdm

I checked the former, it was up to date (removed stuff not used anymore)

There was an additional white control line on top of the desktop which I 
removed.

Starting from a terminal
$ lyx24x
qt.qpa.xcb: QXcbConnection: XCB error: 5 (BadAtom), sequence: 597, 
resource id: 0, major code: 20 (GetProperty), minor code: 0
Warning: 609: Format not supported.
Warning: Quitting.
Error: Dokumentformat-Fehler

but shows lyx. And, heureka, it has the missing top!

loading examples/de/welcome.lyx works alright

loading another file gives
/tmp/lyx_tmpdir.PrXtIVAGvvMT/Buffer_convertLyXFormatetZcbC.lyx ist kein 
lesbares LyX-Dokument.
Must inquire why. Perhaps remove the tmpdir?

Glad that lyx is now showing its normal appearance. Thanks for help and 
patience, especially Kornel and Jürgen

Yours,
Wolfgang