I'm not sure. I actually don't remember exactly what the issue was but they have this in the web install instructions:

"On Linux, GNOME has a bug causing compatibility issues with the installation process. It wrongly detects the phone in fastboot mode or fastbootd mode as being an MTP device and claims exclusive control over it. This will block the install process from proceeding."

There's a workaround but I either didn't try it or it didn't work.