Update auf 3.18.4: Kernel, Kernel-Headers
md5sum linux-image-3.18.4-c720_20150127_amd64.deb
2645b03d2b2b56b5907d7d1798836580 linux-image-3.18.4-c720_20150127_amd64.deb
md5sum linux-headers-3.18.4-c720_20150127_amd64.deb
98ef51bd177a0ed6c92de9496a280fd3 linux-headers-3.18.4-c720_20150127_amd64.deb