Verdict: No
No. GOG say Galaxy is available for Windows and Mac only. Your GOG library still works on Linux through Heroic, which supports GOG officially and does the same job.
GOG's own Galaxy page states the launcher is available for Windows and Mac, and there is no Linux download. That has been the position for years.
Heroic Games Launcher is the answer most people use. It is a free open source launcher for Epic, GOG and Amazon Prime Games, it runs on Linux, and you sign in with your normal GOG account. Your library appears, you press install, and Windows-only games run through a compatibility layer without you setting one up. Lutris will also manage a GOG library if you prefer it.
GOG games are famously free of copy protection, which is why this works as well as it does. A good number of them also have proper Linux versions that GOG hand you directly.
Your purchases are permanently yours and nothing about them changes. Cloud saves, achievements and the friends list are the parts that sometimes lag behind the official launcher.
Free launcher that officially covers GOG, Epic and Amazon. Sign in with your GOG account and the library is there.
Your files: Purchases and downloads are unaffected. Cloud saves and store extras can lag behind Galaxy.
Puts GOG games alongside games from other stores and from old discs in one library. More settings on screen than Heroic.
Your files: Your GOG account and purchases are untouched.
For running a single GOG installer as a Windows program rather than managing a library.
Your files: Works with GOG's offline installer files, which have no copy protection.
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 GOG Galaxy. Everything else you do can move.
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