Erro de Linha mal formada 57 no arquivo de fontes

alexdminas
(usa Ubuntu)

Enviado em 01/04/2013 - 11:11h

Bom dia! Sou novo no ubuntu, instalei o 12.04 e hoje quando fui instalar um aplicativo, recebi a mensagem de erro na linha 57 do arquivo sources.list:

alex@alex-System-Product-Name:~$ sudo apt-get update
E: Linha mal formada 57 no arquivo de fontes /etc/apt/sources.list (análise de distribuição)
E: A lista de fontes não pode ser lida.

Dei uma pesquisada mas não encontrei a solução, só consegui o comando para abrir o arquivo sources.list:

alex@alex-System-Product-Name:~$ cat -n /etc/apt/sources.list
1 # deb cdrom:[Ubuntu 11.10 _Oneiric Ocelot_ - Release i386 (20111012)]/ oneiric main restricted
2
3 # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
4 # newer versions of the distribution.
5 deb http://br.archive.ubuntu.com/ubuntu/ precise main restricted
6 deb-src http://br.archive.ubuntu.com/ubuntu/ precise main restricted
7
8 ## Major bug fix updates produced after the final release of the
9 ## distribution.
10 deb http://br.archive.ubuntu.com/ubuntu/ precise-updates main restricted
11 deb-src http://br.archive.ubuntu.com/ubuntu/ precise-updates main restricted
12
13 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
14 ## team. Also, please note that software in universe WILL NOT receive any
15 ## review or updates from the Ubuntu security team.
16 deb http://br.archive.ubuntu.com/ubuntu/ precise universe
17 deb-src http://br.archive.ubuntu.com/ubuntu/ precise universe
18 deb http://br.archive.ubuntu.com/ubuntu/ precise-updates universe
19 deb-src http://br.archive.ubuntu.com/ubuntu/ precise-updates universe
20
21 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
22 ## team, and may not be under a free licence. Please satisfy yourself as to
23 ## your rights to use the software. Also, please note that software in
24 ## multiverse WILL NOT receive any review or updates from the Ubuntu
25 ## security team.
26 deb http://br.archive.ubuntu.com/ubuntu/ precise multiverse
27 deb-src http://br.archive.ubuntu.com/ubuntu/ precise multiverse
28 deb http://br.archive.ubuntu.com/ubuntu/ precise-updates multiverse
29 deb-src http://br.archive.ubuntu.com/ubuntu/ precise-updates multiverse
30
31 ## N.B. software from this repository may not have been tested as
32 ## extensively as that contained in the main release, although it includes
33 ## newer versions of some applications which may provide useful features.
34 ## Also, please note that software in backports WILL NOT receive any review
35 ## or updates from the Ubuntu security team.
36 deb http://br.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
37 deb-src http://br.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
38
39 deb http://security.ubuntu.com/ubuntu precise-security main restricted
40 deb-src http://security.ubuntu.com/ubuntu precise-security main restricted
41 deb http://security.ubuntu.com/ubuntu precise-security universe
42 deb-src http://security.ubuntu.com/ubuntu precise-security universe
43 deb http://security.ubuntu.com/ubuntu precise-security multiverse
44 deb-src http://security.ubuntu.com/ubuntu precise-security multiverse
45
46 ## Uncomment the following two lines to add software from Canonical's
47 ## 'partner' repository.
48 ## This software is not part of Ubuntu, but is offered by Canonical and the
49 ## respective vendors as a service to Ubuntu users.
50 # deb http://archive.canonical.com/ubuntu oneiric partner
51 # deb-src http://archive.canonical.com/ubuntu oneiric partner
52
53 ## This software is not part of Ubuntu, but is offered by third-party
54 ## developers who want to ship their latest software.
55 deb http://extras.ubuntu.com/ubuntu precise main
56 deb-src http://extras.ubuntu.com/ubuntu precise main
57 deb http://archive.canonical.com/precise partner
58 deb-src http://archive.canonical.com/precise partner

Com esse erro na linha 57, não consigo entrar instalar nada via terminal, os aplicativos do Ubuntu Tweak aparecem como "Não disponível" e nem consigo acessar a central de programas do Ubuntu... Alguém poderia, por favor, me ajudar a solucionar esse problema? Grato!