Can you share the full error message please?
checked the bug report and it seems issue is following
chown: invalid group: ‘papermc:papermc’
Which is strange as the primary group is always pre-created and defaults to same name as user for new users. Just tested on a demo system without issues.
Can you share following
tail -5 /etc/group
frp:x:993: postgres:x:122: jellyfin:x:123: postfix:x:119: postdrop:x:120:
can you check following
getent group papermc
if it doesn’t return anything, create the group manually and rerun the installation
groupadd -r papermc dietpi-sotware install 181