Today i found a cd from garage with postal 1 linux version on it...after some googling i managed to install it but when i start the game its transparent(i can see desktop and icons thru game window) and blue title bar there a way to fix this.
pc specs
Intel Pentium D 2.80Ghz
2gb ddr2
nvidia geforce 8500gt
os xubuntu 12.04-4 32bit