1. dpkg -l | grep linux-image

ii linux-image-2.6-amd64 2.6.32+23 Linux 2.6 image on 64-bit PCs ii linux-image-2.6.30-2-amd64 2.6.30-8squeeze1 Linux 2.6.30 image on AMD64 ii linux-image-2.6.32-trunk-amd64 2.6.32-5 Linux 2.6.32 for 64-bit PCs

aptitude remove linux-image-2.6.32-trunk-amd64