I also recently tried hplip 3.20.6 for a freshly installed xubuntu, but it did not help. (the result of hp-check brought the same result as https://answers.launchpad.net/hplip/+question/690767 (#5). I was forced to downgrade the system again because it is essential to keep the printer functional.
It might be that the same bug affected me after upgrading to 20.04 with another printer: https:/ /answers. launchpad. net/hplip/ +question/ 690767
I also recently tried hplip 3.20.6 for a freshly installed xubuntu, but it did not help. (the result of hp-check brought the same result as https:/ /answers. launchpad. net/hplip/ +question/ 690767 (#5). I was forced to downgrade the system again because it is essential to keep the printer functional.