Jagathy Please give the complete URL (http:/... ) where you got the file slamr-2.6.27-7-generic.tar.gz which gives you a problem. Furthermore: in your first post to this list http://linmodems.technion.ac.il/bigarch/archive-nineth/msg00993.html you wrote: According to this I searched for slamr-2.6.27-7-generic.tar.gz, But cannot get only get slamr-2.6.24-7-generic.tar.gz. I unpack (slamr-2.6.24-7-generic.tar.gz) with tar zxvf slamr*.tar.gz but I got an error message like this gzip: stdin: not in gzip format child returns status. Error exit delayed from previous errors. There you say you could not find 2.6.27.7 , only 2.6.24.7 , but today you cannot depack 2.5.27.7 . Are you using the same URL fo find both? On the linmodems.technion.ac.il Web server there only is 2.6.27.7, not 2.6.24.7: [phep2] /home/goldberg > find $L -name slamr-2.6.2*-7-generic.tar.gz /var/www/html/linmodems/packages/smartlink/Ubuntu/slamr-2.6.27-7-generic.tar.gz That one gets depacked without any problem. This brings me to guess that you have downloaded your slamr* file from some unreliable place rather than, as instructed several times, from http://linmodems.technion.ac.il/packages/smartlink/Ubuntu I furthermore suspect that you did something weird just before giving your command tar zxvf etc... , but it is not worth spending time on that if you agree to do EXACTLY and ONLY what ModemData.txt tells you to do. Jacques