Thanks Pioneer for the additional info. I have used Linux and Ubuntu on the desktop for a very long time. I used Ubuntu at work for programming and systems work. When I built my newest computer about 1 year ago, I looked at Ubuntu hard. I absolutely love Linux and Ubuntu. As I write this and try to remember, the deal breaker for me was no deep-pixel support for my high-end graphics card. I bought a high-end NEC monitor and Nvidia pro graphics card. The video driver available for this card for Ubuntu did not have deep-pixel support. This was perhaps a bit overkill, but I wanted it so I got it. I have not since investigated if an update is available for this. Color management support was also not fully implemented, so that was another reason to not use it.
I already owned Vuescan for scanning. It is cross platform. This will cost you a little money (get the pro version), but it is a one-time purchase and is $80 with lifetime updates. Nice on that IMO.
I had also selected Bibble Pro for my editing and DAM software, which is also cross-platform. IMO, it is a great editor and is TONS faster than Lightroom. I really liked it but it could not handle the larger file sizes from my 6x9 scans. It has now been purchase by Corel, now Aftershot, and does offer larger file size support. But, I really don't like the Corel products and dropped it in favor of Lightroom. I don't like THAT update merry-go-round either. The next time I have to shell out for an update, I will review the Ubuntu offerings again and perhaps make the switch.
I briefly investigated Darktable and I have used the Gimp for photo editing in the past. Darktable seemed to be lacking some features at the time, IIRC. The Gimp did not have >8-bit support per color channel either, or at least it didn't seem to be fully implemented. Perhaps it will in another 10 years.
I don't have an inkjet printer, but I think many are well supported via CUPS. You really need to check into this. An alternative would be to dual-boot for output, although that is a bit of a PITA.
If you have a spare hard drive, I'd replace the hard drive in your new computer, install Ubuntu on that, and experiment. You don't need a huge one to investigate. It might be worth buying a new one just for the test. If you decide to use Windows, you can always use that driver for additional storage. If you are comfortable doing restores and you have the restore disks for your new computer, you can always restore Windows after investigating Ubuntu.
Keep us posted on your progress!
-Rob