@kuuga said in I want installing Ubuntu Touch on a Google Pixel 3a problems: What brand of USB cable do you usually use for this process? Could you recommend one? Just use a good data capable USB cable, anyone in good condition. Also, prefer if you can, using a USB2 plug on your PC, some issue can occur with USB3 plugs.

@kuuga Can you post a screenshot of it? Can you confirm if your device booted into fastboot? Maybe it didn't and if not, you can do it manually - usually by holding volume down + power button until it boots.