please take a look at the following items. The information that you provided to help update the apache and virtalmin seems to be outdated.
I am using the current version of the web host panel with a new installed version of debian that is no older then 1 hour old with the current version of debian.
My comments will start this >>>
Virtualmin on Low Memory Systems A default installation of Virtualmin is configured to maximize performance, rather than minimize memory usage. Thus, on a system with less than 256MB of RAM, problems can arise if steps arenâ