Using new installation of Ubuntu 20.04 and also trying Ubuntu 20.10 Attached scanning device is: Plustek OpticFilm 7600i
From what I had read about "sane-backends-1.0.29-670-gcf5c40b8e", I believe that this film/slide scanner is now supported.
Bus 001 Device 003: ID 07b3:0c3b Plustek, Inc. Film Scanner
$ scanimage -V scanimage (sane-backends) 1.0.29; backend version 1.0.29
$ sane-find-scanner ... could not open USB device 0x07b3/0x0c3b at 001:003: Access denied (insufficient permissions) ...
using sudo, the command works $ sudo sane-find-scanner ... found USB scanner (vendor=0x07b3 [Plustek INC], product=0x0c3b [Film Scanner ], chip=GL842) at libusb:001:003 ...
When I use: $ scanimage -L No scanners were identified.
$ sudo scanimage -L No scanners were identified.
I have been looking and reading various questions/answers and attempting what they indicate, but some of those Q&A apply to really old Ubuntu versions.
I even downloaded the trial software 'Vuescan' from 'Hamricks' site and it works fine scanning a 35mm slide, but it has the overlaid characters on the image. So I would be forced to buy the $100 professional version to work with this Plustek scanner.
Maybe it is possible that the sane backend version that comes installed with Ubuntu 20.04 and 20.10, even though it is v1.0.29, could be an earlier version than "sane-backends-1.0.29-670-gcf5c40b8e".
1) How do I check if "sane-backends-1.0.29-670-gcf5c40b8e" is the version in the Ubuntu 20.04 or 20.10?
2) Any suggestions on how to resolve the 'no scanners found' ... USB permissions problem?
Any help or suggestions are appreciated.