[LightDestory]

Regarding installing the WM and DE components. I got to know of FreeNX/x2Go through a good old friend from FreeVPS.us who initially wrote a guide for this kind of remote desktop. He basically however only installed the "core" components of the WM and DE. I believe that this might slim down the needed resources disk space wise and even RAM usage wise. However don't quote me on that! I didn't really do benchmarking. I remember using this setup myself a few times and RAM usage has been lower (than what you mentioned in the shoutbox) but I used Debian 8 which by default has a quite low memory usage (the blank OS without stuff installed).

@"Hidden Refuge"
Thanks for your report. I tried to search about a "core" package list but I didn't find anything. I tried the following package name:

• xfce
  
• xfce-core
  
• xfce4-minimal
  
• xfce4-core
  

But let me explain a thing: by using the command

apt-get install xfce4

We are installing only the XFCE desktop environment, we are not installing others application, activing sessions.
Meanwhile by using the command

• Code: (Select All)

  apt-get install xubuntu-desktop , you will install a full working xfce environment with standards application such as firefox, editors, ect...
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  apt-get install xubuntu-minimal , you will install a xfce environment with only system applications.

But if you use the previous 2 command you will install and activate windows manager and your server will start up with a XFCE session.
Regarding the Network Manager I am going to edit the warning to be more clear.