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I have installed Ubuntu 12.04 in the morning and since than I'm struggling to do a simple update. I have troubles with apt-get. I have tried every solution i found out on the Internet, but didn't work. Here is the error i encounter when I try to

sudo apt-get update

E: Could not open file /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_precise-     updates_multiverse_binary-i386_Packages.IndexDiff - open (2: No such file or directory)

The whole thing started because when I tried to do the updates I received this error :"Requires installation of untrusted packages" and i found a link, I changed settings to accept source code and all other stuff and it still didn't work.

Then i went into another link and i did something like this:

sudo apt-get clean
cd var/lib/apt
sudo mv lists lists.old
sudo mkdir -p lists/partial
sudo apt-get clean
sudo apt-get update

and after that I had trouble with some keys and I found the solution, but now I have this error.

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So you had no problems installing, and can use your computer normally, but this error crops up when you write sudo apt-get update in a console and write your password? Is this correct? Can you provide details as to what you've tried (links please!) – tucuxi Jul 31 '12 at 12:31

If your Internet connection is stable, the repository may be having an issue.Try to change the download server to the best one by following these steps:

Ubuntu Software Center > Edit menu > Software Sources > 'Ubuntu Software' tab > Change 'Download from:' option to 'Other' > Click 'Select best server' and 'Choose server'

Next, close Software sources and Ubuntu Software Center and try updating...

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You should edit your question to include the information in your last comment (that you moved /var/lib/apt/lists around).

The file that it is not finding is now in /var/lib/apt/lists.old, instead of /var/lib/apt/lists/ - so it cannot find it, and the error message is explaining exactly why.

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Since you've updated you question with extra info, the try this. Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the commands below.

   sudo rm /var/lib/apt/lists/* -vf

and then do

sudo apt-get update

If you still get issues, the try

sudo apt-get update && sudo apt-get upgrade
share|improve this answer
I didn't do this by myself I followed the steps from here link and about what you suggested I receive this: rm: cannot remove `/var/lib/apt/lists/partial': Is a directory – user1513091 Jul 31 '12 at 12:59
Ok that solved the problem with "sudo apt-get update" but now i have again this error "Requires installation of untrusted packages" what to do? – user1513091 Jul 31 '12 at 13:08
See the additional info in my answer. – Mitch Jul 31 '12 at 13:17

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