Comment 5 for bug 1888238

I have found a workaround that kind of works ... The problem is with the sane library, so it has to be downgraded. I restored /usr/lib/x86_64-linux-gnu/sane/libsane-genesys.so.1.0.27 from my previous Ubuntu 18.04 installation and linked it instead of the current version, and that's all, it works for me in Ubuntu 21.10.

# ls -l /usr/lib/x86_64-linux-gnu/sane/libsane-genesys.so.1
lrwxrwxrwx 1 root root 25 Dez 10 22:52 /usr/lib/x86_64-linux-gnu/sane/libsane-genesys.so.1 -> libsane-genesys.so.1.0.32

# cd /usr/lib/x86_64-linux-gnu/sane
# ln -fs libsane-genesys.so.1.0.27 libsane-genesys.so.1
# ls -l libsane-genesys.so*
lrwxrwxrwx 1 root root 25 Jan 4 16:56 libsane-genesys.so.1 -> libsane-genesys.so.1.0.27

You can try to download the libsane-genesys.so.1.0.27 from here https://ubuntu.pkgs.org/18.04/ubuntu-main-amd64/libsane1_1.0.27-1~experimental3ubuntu2_amd64.deb.html