Hi Andreas and Bartosz I have tested on my Buster machine and it works perfectly. Both before and after upgrade this morning.
I don't have any ideas left but please try to reinstall libc6 because it contains /lib64/ld-linux-x86-64.so.2 but I cannot guarantee it will help. https://wiki.debian.org/Multiarch/LibraryPathOverview I am very interested in the answer. Regards Gudjon
