You haven't old us which release you are using but please see this
document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases
Ubuntu 13.10, Saucy Salamander, reached "End of Life" on July 17, 2014,
nearly three years ago.
Please use and/or upgrade to *only* currently supported releases of
Ubuntu.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1683027
Title:
I can't upgrade to 13.10
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