Ubuntu used a patch for this, but it's just a work-around for now and multiple upstream's developers told me that is not the right approach to use. -- debbug#555134 ...
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ID Status▲ Resolution Sev Product Comp Assignee▲ Reporter Summary
5327 CLOS FIXE cri Sisyphus apt-conf placeholder mithraen vendors.list и sources.list хорошо бы перенести в подкаталоги

File a new bug in the "apt-conf-sisyphus" component of the "Sisyphus" product