Critique this build

Solution
you can probably find some faster RAM for the same price aswell. but yes it's good. faster RAM wont make muich of a differenc ein gaming, it will in rendering etc however.
seeing as you will be doing some rendering it's wise to go for 16GB of RAM. perhaps you can switch the r9 290 for a gtx 970, it's a bit more expensive but it's worth it.
also, not all games work on ubuntu, keep that in mind.