The current version of VTune supports Ubuntu* 8.10 and 9.04, kernels2.6.27-7-generic and 2.6.28-11-generic. So it may just be thatthe version is not officially supported.
Onemore thing to check would be if you are using a 64-bit Eclipse. According to the VTune Release Notes ( http://software.intel.com/sites/products/documentation/hpc/vtune/linux/release_notes.htm)"The VTune Analyzer 9.1 for Linux* can be integrated only with the 32 bit version of Eclipse 3.2.1 on Intel 64 systems. Integration into a 64-bit version of Eclipse is not supported."
If that is not the issue you may have to wait for a future release.