My internet computer said good-bye; I suspect that it is the SSD disk that suddenly died. Luckily I have this computer, quite primitive but still working, and in the worst emergency I also have my laptop, but I have lately used it for something else.

I think I will just buy a new SSD disk.

I did not backup my files on that disk, but I am quite sure there was nothing very important. All the important files are elsewhere.