I hit this error when just upgrading unstable container some months old. It as not obvious to me.
Recommended workaround is: apt-get upgrade python apt-get upgrade Is there reason it is not yet fixed? -- Petr Menšík Software Engineer Red Hat, http://www.redhat.com/ email: pemen...@redhat.com PGP: DFCF908DB7C87E8E529925BC4931CA5B6C9FC5CB