HowTo: Create a list of installed packages for Ubuntu

Ref: http://ubuntuforums.org/showthread.php?t=261366

HowTo: Create a list of installed packages
I found out how to do this recently and thought it might be helpful to some people. To output this information to a file in your home directory you would use,

dpkg --get-selections > installed-software

And if you wanted to use the list to reinstall this software on a fresh ubuntu setup,

dpkg --set-selections

followed by

dselect