Error in ubuntu 10.04

I get this error message when trying to become root in terminal or when trying to open package manager or update manager. The message is also displayed in the top task bar next to the time.
(E: Type 'sudo' is not known on line 56 in source list /etc/apt/sources.list
E: The list of sources could not be read.
Go to the repository dialog to correct the problem.
E: _cache->open() failed, please report.)
 I'm not sure what I did last before that error message started to appear.  I added the source.list file I just added the .txt extension to upload it in case that helps find a solution. Thanks

sources.list.txt
cyrax01Asked:
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Dave BaldwinFixer of ProblemsCommented:
Remove the 'sudo' line from the file, it doesn't belong there.

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rysicCommented:
There is propably problem in file /etc/apt/sources.list
Please have a look at similar problem: http://ubuntuforums.org/showthread.php?t=1574859
or send us what you have in file /etc/apt/sources.list
rysicCommented:
I'm sorry I dodn't noticed that attachement.
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cyrax01Author Commented:
I will see if I can try the erase the sudo line trick and get it done right. Dave, would it be possible for you to reupload the file for me the way it should look so I can mirror it with the original?
Dave BaldwinFixer of ProblemsCommented:
This should be it.  I haven't installed 10.04 yet, I'm still running 8.04.
#deb cdrom:[Ubuntu 10.04 LTS _Lucid Lynx_ - Release i386 (20100429)]/ lucid main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

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

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

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. 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/ lucid universe
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid universe
deb http://us.archive.ubuntu.com/ubuntu/ lucid-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-updates 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/ lucid multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid multiverse
deb http://us.archive.ubuntu.com/ubuntu/ lucid-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-updates 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/ lucid-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu lucid partner
# deb-src http://archive.canonical.com/ubuntu lucid partner

deb http://security.ubuntu.com/ubuntu lucid-security main restricted
deb-src http://security.ubuntu.com/ubuntu lucid-security main restricted
deb http://security.ubuntu.com/ubuntu lucid-security universe
deb-src http://security.ubuntu.com/ubuntu lucid-security universe
deb http://security.ubuntu.com/ubuntu lucid-security multiverse
deb-src http://security.ubuntu.com/ubuntu lucid-security multiverse
deb http://packages.medibuntu.org/ karmic free non-free

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cyrax01Author Commented:
Thanks Dave I'll give it a go when I get home.
cyrax01Author Commented:
Thanks allot Dave that fixed my problem.
Dave BaldwinFixer of ProblemsCommented:
Glad to help, thanks for the points.
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