E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages, E:As listas de pacotes ou os arquivos de estado não puderam ser analisados ou abertos

[Oona Castro]

I can't have my update manager launched and can't get any new software or updates.

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
UBUNTU 12.04 LTS

2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
Can't find it.
Message:E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages
E: As listas de pacotes ou os arquivos de estado não puderam ser analisados ou abertos.

3) What you expected to happen
I wanted to install a new software and update existing ones

4) What happened instead
Didn't open at all

This is not the first time it happened. But I've already done a lot of things and reinstalled Ubuntu 3 times in the last 3 months - and really wouldn't like to do it once again to get it working properly.

[Oona Castro (oonacastro)]

I could solve it with instructions from forums - thanks!
I got it with sudo apt-get update
didn't work with sudo apt-get install -f

Thanks!

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Reviewing your bug report it seems that you are experiencing bug 346386. This issue happens when you have tried to update your package information when you are a network that didn't return the right files. This issue can be cleaned up by using the following commands in a terminal:

1.) sudo rm /var/lib/apt/lists/*
2.) sudo apt-get update

Thanks and good luck!

[This is an automated message. I apologize if it reached you inappropriately; please reopen the bug task if it was incorrect.]