At paracer the problem fixed. Looking maybe found a fix I can tell if it is correct:
1 - First type in this: sudo gedit / etc / apt / sources.list.d / medibuntu.list 2 - When you open the file and delete the contents rempleza by this: http://mirror.oscc.org.my/medibuntu/ deb lucid free non-free deb-src http://mirror.oscc.org.my/medibuntu/ lucid free non-free 3 - Then I opened a terminal and type: sudo apt-get update 4 - Then I went to use the Update Manager "and gave me no problems. This is the content that had the file on startup. # # Please report any bug on https://bugs.launchpad.net/medibuntu/ deb http://packages.medibuntu.org/ required free non-free # Medibuntu - Ubuntu 12.04 "Precise Pangolin" # deb-src required http://packages.medibuntu.org/ free non-free # Medibuntu (source) - Ubuntu 12.04 "Precise Pangolin" -- You received this bug notification because you are a member of Medibuntu Packaging Team, which is subscribed to Medibuntu. https://bugs.launchpad.net/bugs/1066448 Title: No recibo actualizaciones en mi sistema operativo Ubuntu 12.04 To manage notifications about this bug go to: https://bugs.launchpad.net/medibuntu/+bug/1066448/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~medibuntu-maintainers Post to : [email protected] Unsubscribe : https://launchpad.net/~medibuntu-maintainers More help : https://help.launchpad.net/ListHelp

