Comment 11 for bug 1740026

I also experience the error with Ubuntu 20.04 LTS (under the hood of Zorin OS 16.3).

in my case caused by the SSD (disk model "INNOVATION__IT"; the underscore representing a non-utf character).

as described above (#9), hotfixing plugins/ubi-prepare.py gets me past the user settings, but then the partitioning wizard is skipped and a frozen installation screen is shown.
seems like plugins/ubi-partman.py has some unreported exceptions (maybe setting one_disk = True or the like?) and hence not going the right route.

correct me if I'm wrong, but I'd be surprised if the disk model (intended for humans) is necessary for the installation: is there a documentation I didnt find, or could a dev direct me to important sections and expected values in the script? I'd be up to trying to hardcode my ssd specs in but find it hard to reverse engineer the scripts..