FYI, Rapid7 has released the 4.0 version of the framework. I ran msfupdate earlier today, and it upgraded in place flawlessly for me (preserved all the stuff in the database). All my old favorites are still there & work, and the new functionality will be very helpful. Some of the changes appear to have resolved a lot of the pcaprub issues that I (and others) have reported in earlier versions.

For comparison, I'm running BT5 32-bit gnome in a virtual machine.

Your mileage may vary, but MSF4 & BT5 appear to be playing nice together for me.