This appears in dpkg.log at the moment that the link is created/modified:
2014-03-25 05:47:29 configure ca-certificates 20130906ubuntu0.12.04.1 <none> 2014-03-25 05:47:29 status unpacked ca-certificates 20130906ubuntu0.12.04.1 2014-03-25 05:47:29 status half-configured ca-certificates 20130906ubuntu0.12.04.1 2014-03-25 05:47:35 status installed ca-certificates 20130906ubuntu0.12.04.1
This appears in dpkg.log at the moment that the link is created/modified:
2014-03-25 05:47:29 configure ca-certificates 20130906ubuntu0 .12.04. 1 <none> .12.04. 1 .12.04. 1 .12.04. 1
2014-03-25 05:47:29 status unpacked ca-certificates 20130906ubuntu0
2014-03-25 05:47:29 status half-configured ca-certificates 20130906ubuntu0
2014-03-25 05:47:35 status installed ca-certificates 20130906ubuntu0