thanks=)Navigate in terminal to your folder with Tibia and then type ./Tibia
Run it in the terminal and see if theres any error msg... If not you have to copy/paste Tibia "That worked for me" It's something about the permision and the owner of the file...I tried Tibia on my laptop with ubuntu but it didnt work. Thought it was because i had no driver for 3d acceleration but when i fixed it by installing the new ubuntu it still didnt. Dont know why :s .. Tibia window disapears as soon as it pops up. maybe someone knows =)