Plex server

[MrWizerd]

Hello all, 

Trying to install the server and I belive I am having trouble with one of the steps

Code:

apt-get install binutils:armhf
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package binutils:armhf is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'binutils:armhf' has no installation candidate

I try to install binutils and this happens, I am not very good at command line stuff much anymore have not used unix since the late 90s and am trying to learn, and while I am picking up things quick, when it comes to the pine I am struggling a bit.  I am trying to get a friend of mine one of these so that he can help me learn to port software and such but for now, how do I go about fixing this problem?

Sorry for the stupid question.