Hello - new to both Affinity and the forums here. I'm another Linux dude that has been using it on desktop/laptop since 2001 and before that, since 1999 on servers. I can't stand Windows.
Presently, I'm running Mint. I have tried the recipe above with both Affinity Photo and Design and get a lot of weird things going on. Design freezes on me randomly.
Photo is something else - So, I can create new files and export them (I've tried PSD, PDF, and JPG). I can then open them later as well.
But trying to open jpgs in the same directory that were created/saved/exported in GIMP causes Photo to crash. Same with all the JPG's created by darktable. Very weird. My fan speed starts whirring like crazy, and then Photo just dies.
I can also not open Nikon RAW NEF files. Same behavior. Photo shows the message "Loading 1 Document," hangs for about 10-15 seconds, then dies.
Oddly, I can open stock images that I downloaded from Dreamstime and that are jpg. I have also been able to open jpgs created with an older point and shoot camera (can't remember the brand) that are jpg.
But it seems to have big issues with with jpgs created with GIMP, darktable, and Nikon.