These instructions are based on this UbuntuForums post, this AskUbuntu question/answer, and this GitHub
Here's how to fix it:
- Make sure you have the kernel sources. I think it's installed standard, though.
- Use git to grab the driver: git clone https://github.com/cnt0/rt5390.git. You may have to install Git as it's not a standard part of Xubuntu.
- Edit rt5390/os/linux/config.mk to ensure the following:
- HAS_ATE=y (no change, it was originally as is)
- HAS_WPA_SUPPLICANT=y (no change, it was originally as is)
- HAS_NATIVE_WPA_SUPPLICANT_SUPPORT=y (no change, it was originally as is)
- HAS_ANTENNA_DIVERSITY_SUPPORT=n (the UbuntuForums poster got this wrong for me)
- Each and every CFLAGS entry has added onto the end of it "-Wno-error=date-time". This is what I got from the AskUbuntu forum up there.
- Run make in the rt5390 folder. After a while it will fail with the last step getting permission denied. This is OK.
- Run sudo make to fix the permissions error.
- Run sudo make install to make all the required folders and put the modules in the right places, etc.
- Edit /etc/modules to add the following line: rt5390sta
- Edit /etc/modprobe.d/blacklist.conf and add the following line: blacklist rt2800pci
- Reboot. You'll know it works when you have a ra0 device when you run ifconfig. You may need to restart the network-manager service, but I did not need to. Of course, you'll also know it's working when you can see your wifi networks and connect!