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How do I re-install Network Manager without an internet connection?

My friend has deleted network Manager. However, now she want connect Internet over using wireless. How can I manage that wish without Network Manager ?

EDIT: It was deleted by using ubuntu software center.

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The easy solution to your problem would be to install back NetworkManager.

But how do you install it back if you do not have Internet access?

It is possible to manually connect to the Internet using an Ethernet cable (technically it is far easier than a wireless connection).

Therefore,

  1. connect the computer with an Ethernet cable to the router,
  2. open a terminal window ('gnome-terminal') and run dhclient eth0 (you should get Internet access now)
  3. and finally start the Software Center and install network-manager-gnome.
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  • No ethernet, do you have any Solution ?
    – user20296
    Aug 4, 2011 at 10:28
  • You can perform a network connection using Wifi and WEP. Can you configure your wireless router to use WEP? (you can then change it back to WPA2). See my other answer below about getting online manually with WEP.
    – user4124
    Aug 4, 2011 at 10:36