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When I am try to update my system , I am getting the following error:

Could not initialise the package information    
An unresolvable problem occurred while initialising the package information.
Please report this bug for the 'update-manager' package and try to include the following error message:
'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

How can I resolve this? Thank you.

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open your terminal and do as

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo apt-get do-release-upgrade

You might have to remove some repositories if they are failing

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