Hi Nick, I think these are the pertinent lines:
libjack0.100.0-0 depends on libjack0 (>= 0.109.2-3mlrepo1); however: Version of libjack0 on system is 0.109.2-2mepcom1.
libjack-dev depends on libjack0 (= 0.109.2-3mlrepo1); however: Version of libjack0 on system is 0.109.2-2mepcom1.
There's a slight version mismatch there. The system is looking for the package suffix 2-3mlrepo1 but it's finding the suffix 2-2mepcom1.
Cheers! Daniel