сообщение об ошибке при открытии строки 57 списка синаптических источников [дубликат]

кажется, что в моем списке источников есть проблема, которую я не могу найти; каждый раз, когда я пытаюсь открыть синаптику, появляется эта ошибка:

E: Malformed line 57 in source list /etc/apt/sources.list (dist parse)
E: The list of sources could not be read.
Go to the repository dialog to correct the problem.
E: _cache->open() failed, please report.

при открытии моего список источников, строка 57, похоже, не существует, вот она;

(Я новый пользователь и могу разместить только две гиперссылки - это последние две строки, и я подозреваю, что одна из них является проблемой ...)

deb-src http://extras.ubuntu.com/ubuntu quantal main
deb-src http://archive.canonical.com partner

Я попытался найти решение и обнаружил похожие проблемы, но не уверен, какую строку следует удалить / заменить ...

# deb cdrom:[Ubuntu 12.10 _Quantal Quetzal_ - Release i386 (20121017.2)]/ quantal main restricted

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

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

deb http://security.ubuntu.com/ubuntu quantal-security main restricted
deb-src http://security.ubuntu.com/ubuntu quantal-security main restricted
deb http://security.ubuntu.com/ubuntu quantal-security universe
deb-src http://security.ubuntu.com/ubuntu quantal-security universe
deb http://security.ubuntu.com/ubuntu quantal-security multiverse
deb-src http://security.ubuntu.com/ubuntu quantal-security 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 quantal partner
# deb-src http://archive.canonical.com/ubuntu quantal partner>

## 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 quantal main
deb-src http://extras.ubuntu.com/ubuntu quantal main
deb-src http://archive.canonical.com partner