@MrT10001 Indeed cleaning the usb port on the phone seems to have solved the issue. Thanks.
Weird since I used the same setup (laptop, phone and cable) to just minutes before flash the PQ3B.190801.002 factory image and then install Ubuntu Touch. Do not even think I disconnected the USB cable anytime during the process.

@Mario-CH Thanks for your tip however use_both_schemes was set to Y by default on my distro.

@marlboro50 @arubislander Same problem here.

Laptop running Pop!_OS 22.04 LTS with latest patches.

Pixel 3a XL running Ubuntu Touch 20.04 Development (20.04 r578).

Neither adb nor lsusb shows the phone.

Looking in the kernel ring buffer using dmesg show the following when connecting the device.

[  614.866393] usb 1-2: new full-speed USB device number 7 using xhci_hcd
[  614.994416] usb 1-2: device descriptor read/64, error -71
[  615.438415] usb 1-2: device descriptor read/64, error -71
[  615.674372] usb 1-2: new full-speed USB device number 8 using xhci_hcd
[  615.806351] usb 1-2: device descriptor read/64, error -71
[  616.042397] usb 1-2: device descriptor read/64, error -71
[  616.150711] usb usb1-port2: attempt power cycle
[  616.562364] usb 1-2: new full-speed USB device number 9 using xhci_hcd
[  616.562539] usb 1-2: Device not responding to setup address.
[  616.770503] usb 1-2: Device not responding to setup address.
[  616.978333] usb 1-2: device not accepting address 9, error -71
[  617.110362] usb 1-2: new full-speed USB device number 10 using xhci_hcd
[  617.110520] usb 1-2: Device not responding to setup address.
[  617.318765] usb 1-2: Device not responding to setup address.
[  617.526334] usb 1-2: device not accepting address 10, error -71
[  617.526404] usb usb1-port2: unable to enumerate USB device

@ubuntumale As been reported by other I had some initial problems getting the installation working.
Even when enabling "OEM unlocking" in the settinsg.
However after issuing a fastboot flashing unlock it went through with out problems.

That said after UT has been installed it is no longer detected by adb even when Developer mode is enabled. Still investigating this problem.