Your sources.list file contains entries for Ubuntu 14.04 however you
have the lsb-release package from Ubuntu 16.04. This has confused the
release-upgrader and caused it to be unable to calculate the upgrade.
While there may be other packages from Ubuntu 16.04 also installed on
your system at a minimum please reinstall the version of lsb-release
from 14.04 and try the upgrade again. Thanks and good luck!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1776202
Title:
can't upgrade to new version
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