I'm sorry, I need to reject this one as well. We opted to remove the NVIDIA option in LMDE 5. It's no longer necessary for new HW like it was in LMDE 4.
- Yes, the keyring contains past releases.
- OEM isn't part of the scope for LMDE.
- We'll have another look at the eject message before stable, but we're shipping BETA with this issue. So far we don't have a fix for it.
This seems to be a normal matter, debian have a rollover process for archive key-ring...
Why are Debian Buster and Stretch in /etc/apt/trusted.gpg.d ?
Still no "Remove install media" message on restart after install
No option for OEM install