If we’re talking in absolutes, state can be overthrown without guns : it’s a social construct, it can be unmade by social means.
Now, it’s far far easier with violence, and violence is easier with guns, so practically and realistically you’re probably right. But eh, i like nitpicking.
Talking from experience with a 3090 on ZorinOS (so Ubuntu family so old kernels i think, maybe it’s different on more recent ones), it mostly works. The two main problems i encountered are screen tearing across all games, and the screen sleep mode which didn’t work (but going from Zorin 17 to 18 solved this one, probably bc newer kernels worked best), and other than that it’s been smooth