In order for you to play Kingdoms and Castles on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 14.10 (64-bit)
Processor (CPU):
Intel Core 2 Duo, 2.0GHz or AMD Athlon 64 X2 6400+, 2.5GHz
Memory (RAM):
4 GB RAM
Graphics Card:
nVIDIA GeForce GTX 260 256mb or ATI Radeon HD 5670 256mb or Intel HD Graphics 4600
Storage:
1 GB available space
In order to play Kingdoms and Castles on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 14.10 (64-bit)
Processor (CPU):
Intel Core i5-3470, 2.7GHz or AMD FX-6300, 3.2Ghz
Memory (RAM):
4 GB RAM
Graphics Card:
nVIDIA GeForce GTX 660, 1gb or AMD Radeon HD 7870, 1gb
Storage:
1 GB available space