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I am trying to install libx11-dev, by:

sudo apt-get install libx11-dev

Then got the following error;

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libx11-dev 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 'libx11-dev' has no installation candidate

I have no idea how to deal it, What should I do ?

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That means libx11-dev is a package Used by Major Application. You need to install that application to get this. This cannot be install seldom. Why do you need this ? –  user224082 Nov 15 '13 at 6:55
    
I am trying to install NS-2 on UBUNTU 13.10, –  user215972 Nov 15 '13 at 11:18

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