This bug was fixed in the package debootstrap - 1.0.59ubuntu0.10
--------------- debootstrap (1.0.59ubuntu0.10) trusty; urgency=medium
* Add (Ubuntu) cosmic as a symlink to gutsy. (LP: #1773496)
-- Steve Langasek <email address hidden> Fri, 25 May 2018 23:59:59 -0700
This bug was fixed in the package debootstrap - 1.0.59ubuntu0.10
---------------
debootstrap (1.0.59ubuntu0.10) trusty; urgency=medium
* Add (Ubuntu) cosmic as a symlink to gutsy. (LP: #1773496)
-- Steve Langasek <email address hidden> Fri, 25 May 2018 23:59:59 -0700