I tried that guide and fell over at step one. It didn't find the repository.
I gave up as I was suffering from brain overload after trying to install a control panel over spotty WiFi. In the end I used the Centos panel, and that seems to do everything I wanted. I've resolved the dns for
Crypto Hints and set up an ftp account. I just dumped the first index page on it that I found on my machine.
I tried to install the Epoch software through a terminal on the Ubuntu machine, but had to give up almost immediately to sort out some other problems.
My difficulty stems from the fact that I've always used managed servers with Softaculous. So I've had to set up the VPS and the DNS server. I also had some problems with Webmin which wouldn't start, but I switched to the Centos panel, and that is working well. I'll have a go at the actual installation tomorrow.