ligado por cabo já consigo fazer update. O resultado de
sudo apt-get update
joao@joao-xxxxxxxxxxxxx:~$ sudo apt-get update
Ign http://extras.ubuntu.com oneiric InRelease
Ign http://security.ubuntu.com oneiric-security InRelease
Hit http://extras.ubuntu.com oneiric Release.gpg
Hit http://security.ubuntu.com oneiric-security Release.gpg
Hit http://extras.ubuntu.com oneiric Release
Hit http://security.ubuntu.com oneiric-security Release
Ign http://ftp.caliu.cat natty InRelease
Hit http://extras.ubuntu.com oneiric/main Sources
Hit http://security.ubuntu.com oneiric-security/main Sources
Hit http://security.ubuntu.com oneiric-security/restricted Sources
Hit http://security.ubuntu.com oneiric-security/universe Sources
Hit http://security.ubuntu.com oneiric-security/multiverse Sources
Hit http://security.ubuntu.com oneiric-security/main i386 Packages
Hit http://security.ubuntu.com oneiric-security/restricted i386 Packages
Hit http://extras.ubuntu.com oneiric/main i386 Packages
Ign http://extras.ubuntu.com oneiric/main TranslationIndex
Hit http://ftp.caliu.cat natty Release.gpg
Ign http://es.archive.ubuntu.com oneiric InRelease
Hit http://security.ubuntu.com oneiric-security/universe i386 Packages
Hit http://security.ubuntu.com oneiric-security/multiverse i386 Packages
Hit http://security.ubuntu.com oneiric-security/main TranslationIndex
Hit http://security.ubuntu.com oneiric-security/multiverse TranslationIndex
Hit http://security.ubuntu.com oneiric-security/restricted TranslationIndex
Ign http://es.archive.ubuntu.com oneiric-updates InRelease
Hit http://security.ubuntu.com oneiric-security/universe TranslationIndex
Hit http://ftp.caliu.cat natty Release
Hit http://security.ubuntu.com oneiric-security/main Translation-en
Hit http://security.ubuntu.com oneiric-security/multiverse Translation-en
Hit http://ftp.caliu.cat natty/restricted Sources
Hit http://security.ubuntu.com oneiric-security/restricted Translation-en
Hit http://security.ubuntu.com oneiric-security/universe Translation-en
Ign http://es.archive.ubuntu.com oneiric-proposed InRelease
Ign http://es.archive.ubuntu.com oneiric-backports InRelease
Hit http://es.archive.ubuntu.com oneiric Release.gpg
Hit http://ftp.caliu.cat natty/universe Sources
Hit http://ftp.caliu.cat natty/multiverse Sources
Hit http://ftp.caliu.cat natty/restricted i386 Packages
Hit http://ftp.caliu.cat natty/multiverse i386 Packages
Hit http://ftp.caliu.cat natty/universe i386 Packages
Hit http://es.archive.ubuntu.com oneiric-updates Release.gpg
Ign http://ftp.caliu.cat natty/multiverse TranslationIndex
Ign http://ftp.caliu.cat natty/restricted TranslationIndex
Ign http://ftp.caliu.cat natty/universe TranslationIndex
Get:1 http://es.archive.ubuntu.com oneiric-proposed Release.gpg [198 B]
Get:2 http://es.archive.ubuntu.com oneiric-backports Release.gpg [198 B]
Hit http://es.archive.ubuntu.com oneiric Release
Ign http://extras.ubuntu.com oneiric/main Translation-en_US
Hit http://es.archive.ubuntu.com oneiric-updates Release
Get:3 http://es.archive.ubuntu.com oneiric-proposed Release [40.8 kB]
Ign http://extras.ubuntu.com oneiric/main Translation-en
Get:4 http://es.archive.ubuntu.com oneiric-backports Release [40.8 kB]
Hit http://es.archive.ubuntu.com oneiric/main Sources
Hit http://es.archive.ubuntu.com oneiric/restricted Sources
Hit http://es.archive.ubuntu.com oneiric/universe Sources
Hit http://es.archive.ubuntu.com oneiric/multiverse Sources
Hit http://es.archive.ubuntu.com oneiric/main i386 Packages
Hit http://es.archive.ubuntu.com oneiric/restricted i386 Packages
Hit http://es.archive.ubuntu.com oneiric/universe i386 Packages
Hit http://es.archive.ubuntu.com oneiric/multiverse i386 Packages
Hit http://es.archive.ubuntu.com oneiric/main TranslationIndex
Hit http://es.archive.ubuntu.com oneiric/multiverse TranslationIndex
Hit http://es.archive.ubuntu.com oneiric/restricted TranslationIndex
Hit http://es.archive.ubuntu.com oneiric/universe TranslationIndex
Hit http://es.archive.ubuntu.com oneiric-updates/main Sources
Hit http://es.archive.ubuntu.com oneiric-updates/restricted Sources
Hit http://es.archive.ubuntu.com oneiric-updates/universe Sources
Hit http://es.archive.ubuntu.com oneiric-updates/multiverse Sources
Hit http://es.archive.ubuntu.com oneiric-updates/main i386 Packages
Hit http://es.archive.ubuntu.com oneiric-updates/restricted i386 Packages
Hit http://es.archive.ubuntu.com oneiric-updates/universe i386 Packages
Hit http://es.archive.ubuntu.com oneiric-updates/multiverse i386 Packages
Hit http://es.archive.ubuntu.com oneiric-updates/main TranslationIndex
Hit http://es.archive.ubuntu.com oneiric-updates/multiverse TranslationIndex
Hit http://es.archive.ubuntu.com oneiric-updates/restricted TranslationIndex
Hit http://es.archive.ubuntu.com oneiric-updates/universe TranslationIndex
Get:5 http://es.archive.ubuntu.com oneiric-proposed/restricted i386 Packages [2,394 B]
Ign http://ftp.caliu.cat natty/multiverse Translation-en_US
Ign http://ftp.caliu.cat natty/multiverse Translation-en
Ign http://ftp.caliu.cat natty/restricted Translation-en_US
Ign http://ftp.caliu.cat natty/restricted Translation-en
Ign http://ftp.caliu.cat natty/universe Translation-en_US
Ign http://ftp.caliu.cat natty/universe Translation-en
Get:6 http://es.archive.ubuntu.com oneiric-proposed/main i386 Packages [169 kB]
Get:7 http://es.archive.ubuntu.com oneiric-proposed/multiverse i386 Packages [1,044 B]
Get:8 http://es.archive.ubuntu.com oneiric-proposed/universe i386 Packages [23.5 kB]
Get:9 http://es.archive.ubuntu.com oneiric-proposed/main TranslationIndex [73 B]
Get:10 http://es.archive.ubuntu.com oneiric-proposed/multiverse TranslationIndex [71 B]
Get:11 http://es.archive.ubuntu.com oneiric-proposed/restricted TranslationIndex [71 B]
Get:12 http://es.archive.ubuntu.com oneiric-proposed/universe TranslationIndex [73 B]
Get:13 http://es.archive.ubuntu.com oneiric-backports/restricted i386 Packages [14 B]
Get:14 http://es.archive.ubuntu.com oneiric-backports/main i386 Packages [3,296 B]
Get:15 http://es.archive.ubuntu.com oneiric-backports/multiverse i386 Packages [14 B]
Get:16 http://es.archive.ubuntu.com oneiric-backports/universe i386 Packages [13.1 kB]
Get:17 http://es.archive.ubuntu.com oneiric-backports/main TranslationIndex [72 B]
Get:18 http://es.archive.ubuntu.com oneiric-backports/multiverse TranslationIndex [70 B]
Get:19 http://es.archive.ubuntu.com oneiric-backports/restricted TranslationIndex [70 B]
Get:20 http://es.archive.ubuntu.com oneiric-backports/universe TranslationIndex [73 B]
Hit http://es.archive.ubuntu.com oneiric/main Translation-en
Hit http://es.archive.ubuntu.com oneiric/multiverse Translation-en
Hit http://es.archive.ubuntu.com oneiric/restricted Translation-en
Hit http://es.archive.ubuntu.com oneiric/universe Translation-en
Hit http://es.archive.ubuntu.com oneiric-updates/main Translation-en
Hit http://es.archive.ubuntu.com oneiric-updates/multiverse Translation-en
Hit http://es.archive.ubuntu.com oneiric-updates/restricted Translation-en
Hit http://es.archive.ubuntu.com oneiric-updates/universe Translation-en
Get:21 http://es.archive.ubuntu.com oneiric-proposed/main Translation-en [56.4 kB]
Get:22 http://es.archive.ubuntu.com oneiric-proposed/multiverse Translation-en [436 B]
Get:23 http://es.archive.ubuntu.com oneiric-proposed/restricted Translation-en [901 B]
Get:24 http://es.archive.ubuntu.com oneiric-proposed/universe Translation-en [14.5 kB]
Get:25 http://es.archive.ubuntu.com oneiric-backports/main Translation-en [2,292 B]
Get:26 http://es.archive.ubuntu.com oneiric-backports/multiverse Translation-en [14 B]
Get:27 http://es.archive.ubuntu.com oneiric-backports/restricted Translation-en [14 B]
Get:28 http://es.archive.ubuntu.com oneiric-backports/universe Translation-en [11.6 kB]
Fetched 381 kB in 2s (144 kB/s)
Reading package lists... Done