Entirely reasonable to not trust me, I'm extremely spoiled and I also don't know what I'm talking about.
The Packers' starting corners at the beginning of training camp were Davon House (who was benched by the Jags last year, though he claims it wasn't because of his play), and third yearer LaDarius Gunter (who has a career total of 12 passes defended, though he did force two fumbles). Backing them up (according to NFL.com and Reddit) are, or were, rookie Kevin King (who got injured two days ago during training camp and hasn't practiced since) and another third year player in Quinten Rollins (who has 14 passes defended over his entire career and suffered a concussion last year after plowing head first into the ground against the Lions last year).
Sam Shields and Micah Hyde are the notable secondary names gone, although Shields spent virtually the entirety of last year on IR. The biggest problem for Green Bay is that there just isn't a lot of experience at cornerback, or in the secondary as a whole. Safety is a bit better than CB; Ha Ha Clinton Dix and Morgan Burnett are the two presumed starting safeties, who are coming into their fourth and seventh years as starters respectively. As far as corner goes, though, your choices are two third year players, a second year player, a rookie, or a guy that the Jags didn't want back.
Shields and Hyde being gone is a downer. I guess I can only hope that the two third year players at CB develop like Clinton-Dix who became a really solid player after (unsurprisingly) making mistakes in his rookie year.
Oh well, I certainly didn't have hopes that Green Bay would have a great defense this year, so I am only mildly disappointed. As long as the offense doesn't suffer injuries, it should at least be entertaining to watch the Packers this year.