This guide will help you to install Webmin to nextcloudpi.
I tried to install webmin to nextcloudpi on odroid xu4 and I had some troubles, so I decided to write an short guide how to do it. Maybe the same problems are existing on some of the other images of nextcloudpi.
At first I started with official guide for debian 9 here: http://www.webmin.com/deb.html, but without success.
After several attempt I found the next implementation, that work for me:
Go to terminal and login as root user:
and add this:
deb https://download.webmin.com/download/repository sarge contrib
Save and close file. Install GPG key with which the repository is signed, with the commands :
apt-key add jcameron-key.asc
To overcome the problem with installing apt-show-versions, removed all installation files:
apt-get purge apt-show-versions
Set on the fly option for apt:
apt-get -o Acquire::GzipIndexes=false update
Now install apt-show-versions and webmin:
apt-get install apt-show-versions webmin
If UFW firewall is active, open 10000 port to be able to access Webmin web panel:
ufw allow 10000/tcp
Now go to https://your-nextcloudpi-ip:10000 and log in with your root user name and password.