you can install it again using synaptic package manager ot

apt-get install network-manager
or you can configure you network settings in /etc/network/interfaces

#example

auto eth0
iface eth0 inet static
address 192.168.0.105
netmask 255.255.255.0
gateway 192.168.0.1
dns-nameservers 8.8.8.8 8.8.4.4

Hope this helps

Swapnil Jain

As you are new to linux you can use Ubuntu. Its good and easy to use and easy to learn. You can find plenty of help on the web.

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Swapni Jain, Indore