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When i have select to install updates from the update manager it says:

Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/l/linux/linux-image-3.0.0-13-generic_3.0.0-13.22_i386.deb
Size mismatch

I have tried several times and through terminal too but the size mismatch repeats itself there too. What is this size mismatch error? Please Help?

I also tried sudo apt-get update and sudo apt-get upgrade, but the error comes again.

Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/x/xserver-xorg-video-intel/xserver-xorg-video-intel_2.15.901-1ubuntu2.1_i386.deb
Size mismatch
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

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possible duplicate of "Size mismatch" error while downloading packages –  Jorge Castro Jul 2 '12 at 21:52
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3 Answers

Try

sudo apt-get update --fix-missing

in terminal and then

sudo apt-get upgrade
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sudo apt-get update && sudo apt-get install --fix-missing

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There may be a problem with the package on the repository's end. I suggest you wait a day or two, check for updates, and then install the updates again later. That should solve the problem.

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