I have been trying to install some kind of network indicator to show my current bandwidth usage on the panel on top of the screen so I decided to install <https://launchpad.net/ubuntu/+source/indicator-network>

But just after I have put 
`sudo apt-get install indicator-network` I have uninstalled a bunch of vital ubuntu applications e.g. network manager - which was my fault because Ubuntu warned me about it but hey! - why would it mark these applications to remove while installing just an indicator ? 

Now I am unable to connect to the internet with that machine on Ubuntu. How can I install network manager back or install it from the USB boot drive with 12.04 that I have ?