Hello, is there any poker site supporting linux? Or any way how to make the software run on this OS?

Pokerstars works under wine.
Ipoker client kinda works too, last time I checked cashier/deposit window wasn't showing up correctly.

Ongame and Entraction both use Java for their downloadable clients, they should work fine in linux too. May require some work to get the installer/launcher to work though. The browser versions work fine without any hassle. On Ongame it is basically the same client, including support for hand histories.

As mentioned, PokerStars works fine in wine. Boss Media did too, the last time i checked. (Except for the timebank animation.)

Main Problem in Linux is the lack of a good HUD. Except for the HUD, PT3 works wine too. If a basic HUD is sufficient for you, take a look at FPDB.