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It seems that I unwittingly discovered a keyboard shortcut to destroy all day's work. If that does indeed exist, I would like to know what I did, in order to not do it again by mistake.
I had been working on a B&W image that I converted to color, created many layers, colored the layers, put effects and transparencies, and, then, by reflex, i pressed something like an "Emacs Chord" (I guess it was Ctrl+x, Ctrl+s), while at the same time did something without knowing on the digital tablet. The image restored to the original B & W state, and closed gimp. When I opened it again, all work was gone and the Undo History was empty.
I do not know if the work can be saved (i seem to not know if there is some backup), but I would like to know exactly what I did or what i pressed.

Ctrl-Q, Ctrl-D will exit Linux and discard all current images without asking confirmations if you are quick enough, but it looks more like Gimp crashed.

Could it be the 'kill' command ? In kubuntu it is ctrl-alt-esc and if you do not spot the cursor change, a click closes the application window. Although that also gives a Gimp 'eeek' crash / restore message when Gimp is next re-opened.

For a long editing session (any application) you should make regular intermediate saves. I believe automatic backups might come in with Gimp 3 . An old plugin autosave_a.py thrown in as a 'maybe useful'. I have just tried it Gimp 2.10.22 / kubuntu 18.04 including a Gimp 'kill' It is self explanatory when run. Might help. 

The usual, unzip, put in ~/.config/GIMP/2.10/plug-ins

Quote:When I opened it again, all work was gone and the Undo History was empty

History is not saved between sessions even without a crash.