In order for you to play Fishing Planet on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 12.04
Processor (CPU):
Dual core from Intel or AMD at 2.8 GHz
Memory (RAM):
4 GB RAM
Graphics Card:
nVidia Geforce 8600/9600GT (Driver v331), AMD HD 2xxx-4xxx (Driver mesa 10.5.9), AMD HD 5xxx+ (Driver mesa 10.5.9 or Catalyst 15.7), Intel HD 3000 (Driver mesa 10.6)
Network:
Broadband Internet connection
Storage:
12 GB available space
In order to play Fishing Planet on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 12.04
Processor (CPU):
Dual core from Intel or AMD at 2.8 GHz
Memory (RAM):
8 GB RAM
Graphics Card:
Graphics Card with 2 GB Video RAM: Nvidia Geforce GTX 660 or equivalent
Network:
Broadband Internet connection
Storage:
12 GB available space