ok, i've done by myself.
i've downloaded a chemical bottle image from internet, i've opened with gimp and scaled it to 55 px saved in .bmp format then renamed "Inventory_chemical_A" (or something like this, check your log for real name i'm at work now
).
then copy paste same image and rename until letter F (so Inventory_chemical_A-B-C-D-E-F ).
now you have 6 images , copy those images in you game path inside /graphic/Inventory.
that's all. you can go on with the game.
I think is a installer problem, so pls Frictional correct it for our poor linux gamers
anyway thx for the game , is really scary XD , great !!!!