[Bug 1132284] Re: This is the following message I received when attempting to open the software updater: E:Malformed line 59 in source list /etc/apt/sources.list (dist parse)

[Mike Bray]

Also, opening sources.list, the output is:
# deb cdrom:[Ubuntu 11.04 _Natty Narwhal_ - Release i386 (20110427.1)]/ natty main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu quantal main restricted
deb-src http://archive.ubuntu.com/ubuntu quantal main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu quantal-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu quantal-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://archive.ubuntu.com/ubuntu quantal universe
deb-src http://archive.ubuntu.com/ubuntu quantal universe
deb http://archive.ubuntu.com/ubuntu quantal-updates universe
deb-src http://archive.ubuntu.com/ubuntu quantal-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://archive.ubuntu.com/ubuntu quantal multiverse
deb-src http://archive.ubuntu.com/ubuntu quantal multiverse
deb http://archive.ubuntu.com/ubuntu quantal-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu quantal-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/ natty-backports main restricted universe multiverse

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https://bugs.launchpad.net/bugs/1132284

Title:
  This is the following message I received when attempting to open the
  software updater: E:Malformed line 59 in source list
  /etc/apt/sources.list (dist parse)

Status in “apt” package in Ubuntu:
  Incomplete

Bug description:
  I cannot open the synaptic package manager, software center, or the
  ubuntu software center in addition to the software updater.

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