Ok. I have installed it in the right order but I don't know what to do now... If I write "/usr/sbin/incept opptimizer_1.5.4_armel.deb" [...] in the Terminal, it just shows me "No such file or directory". Btw: I have installed the 1.5.4 but in the Info it shows me "OPPtimizer version 1.2.7"