I don't have 20.04 connected to any scanners. Still using 16.04 for that.
However ...
I have a dedicated negative scanner. The driver software for it for WinXP was included. I think there is commercial software for $100 for Linux software, but I've avoided that.
https://www.hamrick.com/linux-scanner-software.html Flatbed scanners aren't usually designed for negative scanning. I had an epson flatbed with negative attachment and it didn't product nearly as good scans. It was a huge hassle to use even for regular paper scans.
In the end, since i had many hundreds of slides and negatives to scan, I replaced the flatbed with an auto-sheet-feeding page scanner and a dedicated negative/slide scanner. The sheet-feeding page scanner is from Brother and works with SANE and
gscan2pdf nicely. I'm very happy with that purchase.
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