@olivierlambert The issue was very much on my side (the network configuration was DHCP, so I blame my router). It was definitely not caused by XCP-NG itself.

I suppose the only thing that could potentially be refined on your side is the signposting, as the error message is a little cryptic. Having said that, the error says "source not found", which is absolutely accurate, and I guess there's no way for the installer to know why it can't find the source repository!

The main reason I posted was so the information would be available in this thread whenever the next person searches the same error, but thank you for following it up anyway. This forum is a great resource, and I'm sure I'm not the only one who really appreciates you taking the time to engage with the community and look for opportunities for improvement.

I've just had exactly the same problems - XOA wouldn't deploy either through the web interface or the CLI. After much squinting and pondering and trial and error, I eventually traced it to a DNS issue. I changed the DNS nameserver to 1.1.1.1 and it now works perfectly.

I then excitedly looked for this thread again to post the solution, and accidentally came across this very similar thread where the solution is in the first reply. https://xcp-ng.org/forum/topic/4500/xoa-deployment-issue

Oh well, those are 2 hours of my life I'll never get back! I hope this helps someone else!