What drivers are we talking about?
Ubuntu should support Radeon without any problems by default.
Atheros is a gamble if it works or not.
MSI does not provide Linux support, in fact hardly any manufacturer does as it depends on the chip-manufacturer.
AMD Radeon has very good support in Linux as AMD gave all info on Radeon to the Linux community.
As with all hardware, you have to check the chip-manufacturer if they make/support Linux drivers, if they don't you have a problem.
Most chips work, but not all.