E: Malformed line 42 in source list /etc/apt/sources.list (dist parse)

To clarify, change:

deb http://archive.canonical.com/lucid partner

To:

deb http://archive.canonical.com lucid partner

HTH

Thanks arochester, that solved my question.

Thanks Andrew,

So fast an answer that helped me, thats really cool! God bless you!

Hi ,
 Even i am facing same kind of issue. Could you please help me here.

 sudo apt-get update
E: Malformed line 42 in source list /etc/apt/sources.list (dist parse)
E: The list of sources could not be read.

# deb cdrom:[Ubuntu 12.04 _Precise_ - Build amd64 LIVE Binary 20130203-13:50]/ precise main

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://mirror.kavalinux.com/ubuntu/ precise main restricted

## Major bug fix updates produced after the final release of the
## distribution.

## 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://mirror.kavalinux.com/ubuntu/ precise 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://mirror.kavalinux.com/ubuntu/ precise multiverse

## 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.

## 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 precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner

## Uncomment the following two lines to add software from Ubuntu's
## 'extras' repository.
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main
deb http://archive.canonical.com/ partner
deb-src http://archive.canonical.com/ partner
deb http://security.ubuntu.com/ubuntu/ precise-security restricted main multiverse universe
deb http://mirror.kavalinux.com/ubuntu/ precise-updates restricted main multiverse universe
deb http://mirror.kavalinux.com/ubuntu/ precise-backports restricted main multiverse universe

run:

gksudo gedit /etc/apt/sources.list

remove these last lines:

deb http://mirror.kavalinux.com/ubuntu/ precise-updates restricted main multiverse universe
deb http://mirror.kavalinux.com/ubuntu/ precise-backports restricted main multiverse
universe

Save the new files, close gedit, and run:

sudo apt-get update