Bug#928958: scanbd: wrong permissions - stopped working in Buster
In Debian Stretch libsane adds an ACL for group scanner
via /lib/udev/rules.d/60-libsane.rule:
ENV{libsane_matched}=="yes",
RUN+="/bin/setfacl -m g:scanner:rw $env{DEVNAME}"
IIUC in Debian Buster this line is removed because local user access is
given via libpam-systemd.
scanbd stopped working in Buster because the group for daemon processes
is set to scanner in /etc/scanbd/scanbd.conf
and /lib/systemd/system/scanbm@.service.
Since the scanbd package also supplies an udev rule to set the group of
the device node to saned, the bug would be fixed by changing the group
in scanbd.conf and scanbm@.service to saned.
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