Thanks for your report.
Could you please open a Terminal from the menu Applications → Accessories →
Terminal and type:
(if the system ask you a password give your user password, you will not see
nothing when you type it, then press enter)
sudo apt-get clean
sudo apt-get update
sudo apt-get upgrade
Does it still produce the error ?
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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Update-Manager aborts saying Size mismatch on 3 packages
https://bugs.launchpad.net/bugs/501722
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