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I've already installed apm and running sites on my server.
But after I installed webmin and installed virtualmin module on it,
(1) images on browser and downloaded via ftp cannot be opened. (2) all permission were changed.(There are wordpress, drupal, and korean cms 'XE'. All sites are broken.)
Then, I removed webmin, virtualmin, apm and installed apm again. Error shows up again.
I need your help.
Well... I hope you have a backup of your server, otherwise spotting all possible problems might be a lot of work, especially over a forum. :(
Manually installing Virtualmin, as you obviously tried, can be a real hassle and involves lots of configuration stuffs, and deep knowledge of the applications and config files involved. The same goes for manually removing it...
The recommended way to install Virtualmin is via its installer script on a fresh system, having it download, install and configure all required packages (and only those) automatically. Afterwards migrate any existing sites to it, by restoring them from a backup or importing them from a foreign control panel backup or similar.