Ошибка обновления apt-get Ошибка при извлечении

Я пытаюсь обновить репозиторий, но он показывает эту ошибку:

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/Release  Unable to find expected entry 'partner/source/Sources' in Release file (Wrong sources.list entry or malformed file)

E: Some index files failed to download. They have been ignored, or old ones used instead.

/etc/apt/sources.list выглядит так:

> #############################################################
> ################### OFFICIAL UBUNTU REPOS ###################
> #############################################################
> 
> ###### Ubuntu Main Repos deb http://us.archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse deb-src
> http://us.archive.ubuntu.com/ubuntu/ precise main restricted universe
> multiverse
> 
> ###### Ubuntu Update Repos deb http://us.archive.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse deb
> http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted
> universe multiverse deb http://us.archive.ubuntu.com/ubuntu/
> precise-backports main restricted universe multiverse deb-src
> http://us.archive.ubuntu.com/ubuntu/ precise-security main restricted
> universe multiverse deb-src http://us.archive.ubuntu.com/ubuntu/
> precise-updates main restricted universe multiverse deb-src
> http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted
> universe multiverse
> 
> ###### Ubuntu Partner Repo
> # deb http://archive.canonical.com/ubuntu precise partner
> # deb-src http://archive.canonical.com/ubuntu precise partner
> 
> ###### Ubuntu Extras Repo
> # deb http://extras.ubuntu.com/ubuntu precise main
> # deb-src http://extras.ubuntu.com/ubuntu precise main
> # deb http://archive.ubuntu.com/ubuntu trusty main universe restricted multiverse
> # deb http://archive.ubuntu.com/ubuntu trusty-updates main universe multiverse restricted