That sounds like pure nonsense. I've used two G1's with over a dozen different DAC's in the last five years and never had or heard of a compatibility issue. Typical audio forum BS from users who can't read a manual. 

The only compatibility issues you may face is if the dac usb driver isn’t compatible with linux. Check with Lampizator for this. 
I had the G1 it was decent but I tried Lumin U1 Mini and preferred it over the G1 on sound quality alone. The UI on the Auralic is light years ahead of the Lumin though. The screen on the Auralic didn’t do much for me so I ended up shutting it off. Also had issues with network several times and required me to reboot the G1. Lumin is stable. I tried both streamers with Roon. The Auralic sounds better using its lightning DS software. Lumin sounds about the same with or without Roon. May be they addressed the software issues that caused network connectivity problems by now…don’t know. It’s been a couple of years without Aurelic in my system. 

Those who doubt what I said should look at the Auralic forum.

I have never had the problem myself and was surprised to read about it. But apparently, a small minority of DACs have something weird about the USB connection.

I, too, have the G1 with the PS mod. I really like the sound, the look and it's a well built piece. I've compared it with the Lumin and the Rose 150b and I sent them back. The app works very well on my ipad and I'm using the USB out to an Anthem STR Preamp (see virtual system)