How can I get into the trunk of 98 Jaguar XK8 battery is dead previous owner rekeyed ignition but not trunk glove door I tried jump starting under hood at the little knob next to the fuse box?

It sounds like you only have a "valet key" My valet key is green. The main key is black. The valet key will not open the trunk or the glovebox.

If you do not have a main key you should be able to get one from a dealer using the VIN #