Thanks so much for the provided workaround. On Ubuntu 20.04, /etc/default/tlp no longer exists. Instead, I created a file /etc/tlp.d/50-usb-blacklist.conf containing only this line:
USB_BLACKLIST="091e:0003"
After "systemctl restart tlp", gpsbabel worked fine with my Garmin eTrex Vista HCx.
Thanks so much for the provided workaround. On Ubuntu 20.04, /etc/default/tlp no longer exists. Instead, I created a file /etc/tlp. d/50-usb- blacklist. conf containing only this line:
USB_BLACKLIST= "091e:0003"
After "systemctl restart tlp", gpsbabel worked fine with my Garmin eTrex Vista HCx.