No, no other package management application running at the same time.

I'm not sure what is causing that error since the lock seems to be created by 
the upgrade process. 
Eg. if i start the upgrade via "do-release-upgrade" and try to run apt 
simultaneously, apt will exit out because there's already a lock.

If i run apt alone, it works fine and doesn't complain about any lock.

If i try run "do-release-update" simultaneously as running apt manually,
the upgrade exits out much earlier because of the pre-existing lock.

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  PermissionError on upgrading from 16.04 to 16.10

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