I've tried to upgrade from 16.10 to 17.04 and got the same error.
Changed /usr/sbin/do-release-upgrade from
print(_("For upgrade information, please visit:\n"
"%(url)s\n") % { 'url' : url })
to
print(_("For upgrade information, please visit:\n %(url)s\n") % {
'url' : url })
and upgrade have started.
Ubuntu - ignoring bugs over centuries! ))
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https://bugs.launchpad.net/bugs/1499391
Title:
do-release-update crashes on lines 126-127
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