I see this problem on Ubuntu Dapper. The following packages do not show a changelog.
gdb gnomebaker libmono-dev libmono0 libssl0.9.8 libxine-main1 mono mono-classlib-1.0 mono-classlib-2.0 mono-common mono-devel mono-gac mono-gmcs mono-jay mono-jit mono-mcs mono-utils openssl -- update-manager shows no changelog for various packages https://launchpad.net/bugs/40058 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs