In order for you to play Magicka 2 on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 12.04
Processor (CPU):
3GHz Dual Core (Intel Pentium G3220 or higher / AMD A4-4000 or higher)
Memory (RAM):
2 GB RAM
Graphics Card:
Nvidia GeForce 550 or better / ATI Radeon HD 5850 or better
Storage:
3 GB available space
In order to play Magicka 2 on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 14.04 LTS
Processor (CPU):
2.8GHz Quad Core (Intel Core i5-2300 or higher / AMD A8-3850 or higher)
Memory (RAM):
4 GB RAM
Graphics Card:
Nvidia GeForce 640 or better / ATI Radeon HD 6670 or better
Storage:
3 GB available space