You cannot upgrade because of the unsupported PPA's you have on the system.
They are whats causing the upgrade to fail. You need to use a tool such as
'ppa-purge' to remove all the unofficial PPA's from the system, then try the
upgrade again.
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** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/789631
Title:
update-manager can not update new ubuntu release
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