How do you file a bug against a package that doesn't appear on Launchpad?

[Luca Dionisi]

Another guess.

Search for it in packages.ubuntu.com.
Is this a good result:

http://packages.ubuntu.com/feisty/devel/vmware-server-kernel-modules

>From that page, there is a link to "Bug reports"

https://launchpad.net/ubuntu/+source/linux-meta/+bugs