I have the same error after upgrading from gutsy. I will add the following two methods do not fix the issue: sudo apt-get clean && sudo apt-get update && sudo apt-get upgrade
&
sudo apt-get clean && sudo apt-get update && sudo apt-get --reinstall install update-manager --purge
I have the same error after upgrading from gutsy. I will add the following two methods do not fix the issue:
sudo apt-get clean && sudo apt-get update && sudo apt-get upgrade
&
sudo apt-get clean && sudo apt-get update && sudo apt-get --reinstall install update-manager --purge