To fix your /etc/network/interfaces file, go to a terminal
(Application > Accessories > Terminal) and enter the following command:
sudo gedit /etc/network/interfaces
This will launch a text editor with the interfaces file opened in it.
In this file, put a comment (#) in front of EVERY line of the file
EXCEPT for these two lines:
auto lo
iface lo inet loopback
Click SAVE on the text editor and reboot your computer.
It should now boot faster and connect to networks more easily.
NOTE:
Unless you are dealing with static IP addresses (which is pretty rare for the
general end-user) you should NOT establish a network connection by going to
System > Administration > Network.
Instead, you should connect to the Internet using the Network Manager icon
in the upper right corner of your screen (the one that looks like a little
computer monitor).
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