In order for you to play Valheim on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Any up to date version
Processor (CPU):
2.6 GHz Dual Core or similar
Memory (RAM):
8 GB RAM
Graphics Card:
GeForce GTX 950 or Radeon HD 7970
Storage:
1 GB available space
In order to play Valheim on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Any up to date version
Processor (CPU):
i5 3GHz or Ryzen 5 3GHz
Memory (RAM):
16 GB RAM
Graphics Card:
GeForce GTX 1060 or Radeon RX 580
Network:
Broadband Internet connection
Storage:
1 GB available space