Bug#934713: os-prober: missing dependency on mount

[Johannes 'josch' Schauer <josch@debian.org>]

Package: os-prober
Version: 1.76
Severity: important

Hi,

The script /usr/lib/os-probes/50mounted-tests calls the `umount` utility
which resides in the mount package. But os-prober does not depend on
mount and thus one might get this error message:

Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.2.0-2-amd64
Found initrd image: /boot/initrd.img-5.2.0-2-amd64
/usr/lib/os-probes/50mounted-tests: 10: umount: not found
rmdir: failed to remove '/var/lib/os-prober/mount': Device or resource busy


The mount package used to be Essential:yes. Since version 2.29.2-3 it is
not essential anymore and os-prober should depend on it.

Thanks!

cheers, josch