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
14699 CLOS DUPL min Sisyphus apt placeholder ildar error: read failed: Is a directory (21)

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