Two options off-hand: Paradox's in-house games are all linux-based. Unity does linux as a compilation target, but I understand their reputation isn't great, and may limit their ability to take interns. Hope you figure something out!
One time I asked a Linux question in unity forums and the only response I got was something along the lines of "you people have no idea how lucky you are that unity is under contract to have a Linux version. It's almost up though and soon we won't have to deal with Linux questions"
Just use Godot or make your own with Irrlicht or Ogre. Fuck unity and fuck unreal, I'm not making a game if I have to do it in fucking Windows. The ui is too clunky and slow for the type of asset pipelining and file management that a game development or mod development workflow demands.
Anywhere in Europe? Could contact Wube. I don't know if they take interns but it's worth a shot.
I did contact Wube, they said they can't take interns sadly :') Would be awesome to work with them.
I was going to say Image & Form, the makers of the Steamworld games, but they've been assimilated into Thunderful, so that's my answer.
Irongate in Sweede or Funcom in Norway, are two right off the top of my head.
Maybe Egosoft
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