After the last dist-upgrade of my 64Bit system this week I encountered that my HP 5520 was no longer supported by sane.
Versions:
libsane-hpaio 3.14.6-1+b3 amd64
sane 1.0.14-11 amd64
While printing was no problem I guessed this would not be a hardware or a connection problem (USB).
A "scanimage -L" told me that there were no devices found, so did xsane.
Using strace while starting scanimage I found those line:
open("/usr/lib/x86_64-linux-gnu/sane/libsane-hpaio.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
The libsane-hpaio package places the libs only in /usr/lib/sane/libsane-hpaio.so.1.0.0, so sane is not able to find it.
Workaround here is to place a symlink in usr/lib/x86_64-linux-gnu/sane/
ln -s /usr/lib/sane/libsane-hpaio.so.1.0.0 /usr/lib/x86_64-linux-gnu/sane/libsane-hpaio.so.1
Afterwards sanning worked again perfectly.
Best regards
Burkhard