I have Kubuntu 13.04 (unsupported release), and want to upgrade it to 14.04.
When I'm trying to run do-release-upgrade I got this error:
Traceback (most recent call last): File
"/usr/bin/do-release-upgrade", line 123, in
"%(url)s\n") % { 'url' : url }) ValueError: unsupported format character '?' (0xa) at index 55
I know that I should upgrade to 13.10 first. I read the documentation, but when I tried to add old-releases repository to my sources list, something like deb http://old-releases.ubuntu.com/ubuntu/ raring main restricted universe multiverse I get 404 error while updating my sources.
Is this documentation too old to help me? Where can I find newer docs? Or can you show me other way to upgrade my OS?
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