Comment 93 for bug 1788997

Just to avoid confusion:

I have enabled selective installation of packages from bionic-proposed as discussed in <https://wiki.ubuntu.com/Testing/EnableProposed>. I.e. there's a step missing:

2.5. Add file `/etc/apt/preferences.d/proposed-updates` with contents

Package: *
Pin: release a=bionic-proposed
Pin-Priority: 400