Latest VTune Amplifier XE 2011 only supports until Ubuntu 11.10, 12.04 might not be tested.
1. The user can run SpecCpu2006 manually, then use amplxe-cl to attach target process. Is it difficult to find pid? Use "ps -aux"
2. Use "amplxe-cl -collect hotspots -duration 360 -r r0001hs-target-pid pid", for example. You can de-attach analysis by using: "amplxe-cl -command detach -r r0001hs"
3. I think that this is not the VTune issue, you may raise this g++ 4.6 issue to Linux forum.