You seem to have vim installed from a PPA on Ubuntu 16.04 which is
causing the failure to calculate the upgrade. Please install vim from
the official Ubuntu archive and then try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1816323
Title:
Cannot upgrade from 16.04 to 18.04
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