I want to install Ubuntu 11.10 on my external hardisk in order to do my assignment running NS (Network Simulator).
Can NS be running or working properly if my Ubuntu installed on an external hard disk?
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3 Answers
Where you install Ubuntu shouldn't effect what you can run on it. As long as NS runs on it normally (no experience with this) you should be able to run it fine on your external harddrive.
NOTE: Just because it is an external harddrive, doesn't mean you will be able to move the ubuntu installation from computer to computer and it could cause issues if you have additional external devices plugged in.
Click the Try It section's Show Me How button on the Ubuntu Downloads page: http://www.ubuntu.com/download/ubuntu/download
It will give you a quick idea how you can boot a USB copy of Ubuntu as "Live CD" sort of mode -- but I wouldn't count on being able to persistently store data easily with this mode. I mean, you'll be able to mount any filesystem you could normally, and save data there, but if you're here asking this question, it might be more subtle than you're prepared to handle.
Once it is up and running, you'll be able to install ns via: sudo apt-get install ns3 ns3-doc. Maybe sudo apt-get install gns3. (I don't know NS; I just know that it is packaged for Ubuntu already.)
I think it works fine as long as you keep the harddisk attached to the computer when you choose ubuntu, After booting up.