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Installing ISPConfig on Turnkey/Core
I have mentioned in other posts that I was struggling to install ISPConfig (my preferred hosting control panel) on Turnkey.
Turns out it was actually quite easy. The first thing is you can't run it in a container as it fiddles with disk quotas and then when you do install Turnkey/Core in a VM, you need to allow packages from the non-free repository.
Full details: here (opens in new tab)
Thanks for sharing your info about installing ISPconfig. Out of interest, over the years we have had quite a few requests for that. But IIRC it has been at least a few years since anyone has mentioned it. We're not against it, but it overlaps with Webmin quite a bit so we've just stuck with Webmin.
I have a strong suspicion that if you really wanted to, ISPconfig could be installed to a container. But the devil is always in the detail and whether or not the research, trial-and-error and general mucking around are worth it (with the possibility that you may hit a limitation without a clear workaround).
Even if you can't get it working "properly", if you're the only user, I'm sure that you could hack around the quota requirement.
But I'll leave that with you for now.