I'm using Ubuntu 20.04.
When I try to start Victor Vran, it tells me that a OpenGL 3.2 compatible GPU is needed. I have such a GPU, but it's somehow not recognized.
Someone got the same problem and knows a solution?

Very belated, but hopefully at least helpful for future readers:
I encountered the same with 18.04. I also saw How I got Victor Vran running in Manjaro Linux, which doesn't translate over directly, but gave enough of a hint.

The problem is basically with one (or more) of the included libraries, which is too outdated to work on modern systems. It'd be helpful to pinpoint the exact library, and disable just that, but I couldn't be bothered to myself given the large amount of libraries shipped with the game.
Rather than renaming all of i386 and installing a whole bunch of system libraries as is suggested in the Manjaro thread, I did the following:

rename game/i386/usr to something else
rename game/i386/lib/i386-linux-gnu/libgpg-error.* and libkeyutils.* to something else
install libcurl3-gnutls:i386 (you could probably also restore game/i386/usr/lib/i386-linux-gnu/libcurl-gnutls.*)

That was enough to make the game work for me; depending on what system libraries you have installed, you might need to install/restore more. Just run the game from the console and see what it complains about.