No. Affinity is made for Windows and Mac only, and the relaunched free Affinity still offers no Linux download. Krita and GIMP are the closest free replacements, and neither opens your .afphoto files.
Affinity Photo by Canva · Photos & graphics · No way to run it
Affinity changed a lot when Canva relaunched it. Photo, Designer and Publisher were folded into one app that is
free for individuals, with some extras reserved for a paid Canva subscription. What did not change is the platform
list. The download page offers Windows and Mac, an iPad version is being worked on, and Linux is not there.
There is no browser version of Affinity either, so unlike Word or Figma there is no way to reach it from a Linux
machine through a web address.
The practical route is to pick a new editor. Krita is the better fit if you paint, retouch or work with layers and
brushes. GIMP is the better fit for cutting things out, fixing photos and general image work. Both are free and
both install from your Linux system's app store.
Your files are the sore point. The .afphoto format is not readable by anything else. Before you wipe the Windows
machine, open each Affinity file you care about and export it, as a layered PSD if you want to keep the layers, or
as a PNG, TIFF or JPEG if you only want the finished picture.
Runs in a browser and its layout copies Photoshop closely, so it is the quickest thing to be productive in on day one. It is free with adverts.
Your files: Opens PSD, TIFF, PNG and JPEG. Export your Affinity work as PSD before you leave Windows.
This doesn't have to stop you
One stubborn program doesn't have to decide the whole question. You can keep Windows on the same PC and restart into it only when you need Affinity Photo. Everything else you do can move.