Looking at the changelog:
 20111025: Drop bogus c_rehash on upgrades, ...
 20110421:   * Depend on openssl 1.0.0 and force a call of c_rehash so that we 
have both the old and new style of symlinks.  (Closes: #611102)

I fully suspect that the bug was introduced upstream in oct 2011.
If that's the case, then ubuntu introduced it 2014-03-05 with the security 
update to 20130906ubuntu0.12.04.1.

At this point in time, this bug only affects machines upgrading from
lucid to precise, and can be worked around by running c_rehash manually
after do-release-upgrades finishes.  It probably deserves to languish
without fixes until precise EOL in 2017, and then get closed as fully
uninteresting.

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https://bugs.launchpad.net/bugs/1472378

Title:
  upgrading ca-certificates results in broken certificate chains

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