I also ran into it.
As the backtrace suggests, this comes from the package manager finding
third party sources in sources.list:
This line fails:
logging.debug("entry '%s' was disabled (unknown mirror)" %
get_string_with_no_auth_from_source_entry(entry))
So a work around that fixed it for me is to manually comment out all my sources
not directly from ubuntu in the file /etc/apt/sources.list , that is putting a
comment caracter (#) in front of each line starting with deb http:// and not
pointing to an official ubuntu repository.
I imagine you could achieve the same effect by unselecting those third
party repository in the package manager configuration window.
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https://bugs.launchpad.net/bugs/1186936
Title:
do-release-upgrade -d crash when trying to upgrade to saucy
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