Dear Maintainers,

I'm not using Debian (I'm using Ubuntu), but I installed openvas-related
packages in debian's sid repository because these packages are outdated
in Ubuntu's repository.
(I upgraded openvas-related packages with Debian's repository's one
after setting up Ubuntu's repository's one.)
After upgrading them to a newer version, `systemctl start gvmd` failed.
(I could before upgrading them.)

Sorry for my bad English. I'm not a native speaker, so I might have made
some mistakes...