Comment 239 for bug 1728012

Thanks @renbag. With your help I'm now confident enough to proceed with the principal bionic change.

As regards support for the /usr/lib64/sane directory, I would like to know if that change will be accepted in Debian before acting; please see <https://bugs.debian.org/931297#20>. So right now I'm waiting for an answer to my question in that message.