The same on trying to upgrade from 17.10 to 18.04.1
#2 helped
The issue may somehow be related to gettext with certain locales.
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https://bugs.launchpad.net/bugs/1499391
Title:
do-rele
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 })
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1499
