Comment 1 for bug 1836616

Kyle and Jamie kindly provided their opinion on the matter at https://forum.snapcraft.io/t/auto-connecting-the-cups-control-and-password-manager-service-interfaces-for-the-chromium-snap/4592/8 and https://forum.snapcraft.io/t/auto-connecting-the-cups-control-and-password-manager-service-interfaces-for-the-chromium-snap/4592/9.

I'm going ahead with connecting the interface in the deb's pre-install script, on package upgrades only.