This is likely due to the opencpn PPA have you enabled and installed.
You'll need to use the tool ppa-purge to disable it and remove the
packages from that PPA and then try upgrading again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1628802
Title:
can not upgrade to 16.04
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