Comment # 1 on bug 1188068 from Fabian Vogt

There's another issue after that, firstboot_write_wsl.rb is not compatible with
the new yast2-users and crashes. I made sr 904559 as a quick fix (which breaks
compatibility with older YaST), but I wonder whether that could just be done in
a firstboot script instead.

Showing the root step only when necessary is handled in yast2-users,
reassigning to YaST. I'll attach y2log, it contains a second run with my fixed
yast2-firstboot-wsl as well which can be ignored.