I've always wanted to do music recording on Linux (literally since the 90s). The fact that my preferred DAW (Reaper) has long been native to Linux has tempted me. But I have Universal Audio "Apollo" interface and have bought into their whole ecosystem which is very good and runs really great on my mac.
If I made the plunge I would get an RME USB audio interface and use Reaper, maybe play around with Bitwig which is also native on Linux. I don't think I would mess with WINE, regardless of other's success stories with it.
I'm glad to see where things have gone in recent years though
I have a RME _PCIe_ Raydat card that is supported by Linux. It has 4+4 ADAT ports, meaning 32in+32out channels. You can connect basically every interface that has ADAT to it. I've connected two Ferrofish Pulse8 AE, a Focusrite Scarlett and a Motu Traveler. :-) If your UA Apollo has ADAT, you still can use it this way! Of course it hasn't to be a RME Raydat, any other Linux supported interface with ADAT does it too, f.ex. a Scarlett. You could get a cheap Scarlett and connect your Apollo to it. Hahaha. Seriously, this would work.
There is also Ardour which is FOSS and would be enough for recording as well as Traktion Waveform which has a free and a Pro version, if my memory is correct the difference is what kinds of instruments/effects plugins come bundled with it.