This isn't a bug in texinfo, who/whatever set that option in
/etc/environment is to blame.
** Changed in: texinfo (Ubuntu)
Status: New = Invalid
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** Attachment added: AptOrdering.txt
http://launchpadlibrarian.net/46580897/AptOrdering.txt
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/46580898/Dependencies.txt
** Attachment added: Df.txt
http://launchpadlibrarian.net/46580899/Df.txt
** Attachment added: