apt-get install tends to throw lots of Yes or No prompts, asking if dependent packages need to be installed or not. If you are installing a package that is large or with lots of dependencies or installing a number of packages, answering these prompts keeps you from switching to do some work.
One solution is to request
apt-get install to automatically answer Yes to all the Yes or Not prompts that might come up during installation.
To do that during an installation of a package Foo:
$ sudo apt-get install --yes Foo
Tried with: Ubuntu 12.04 LTS