Tried the above command and got a message stating it's not there. :(
Here's my /etc/apt/sources.list file. Am I missing something? Thanks
in advance.

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://us.archive.ubuntu.com/ubuntu/ feisty main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ feisty main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ feisty-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ feisty-updates main
restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the
Ubuntu
## team, and may not be under a free licence. Please satisfy yourself
as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu
security
## team.
deb http://us.archive.ubuntu.com/ubuntu/ feisty universe
deb-src http://us.archive.ubuntu.com/ubuntu/ feisty universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the
Ubuntu
## team, and may not be under a free licence. Please satisfy yourself
as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ feisty multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ feisty multiverse

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any
review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ feisty-backports main
restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ feisty-backports main
restricted universe multiverse

deb http://security.ubuntu.com/ubuntu feisty-security main restricted
deb-src http://security.ubuntu.com/ubuntu feisty-security main restricted
deb http://security.ubuntu.com/ubuntu feisty-security universe
deb-src http://security.ubuntu.com/ubuntu feisty-security universe
deb http://security.ubuntu.com/ubuntu feisty-security multiverse
deb-src http://security.ubuntu.com/ubuntu feisty-security multiverse