Good day Guys I have worked around that Problem with yum and statically specified the release as 4.4 CentOS but now another problem with chroot arises . when i chroot chroot $LIVE chroot: cannot run command `/bin/bash': No such file or directory and to display the ls $LIVE/bin/ alsaunmute dd gtar mknod rpm traceroute arch df gunzip mktemp rvi traceroute6 ash dmesg gzip more rview true ash.static dnsdomainname hostname mount sed umount awk doexec igawk mt setfont uname basename domainname ipcalc mv setserial unicode_start bash dumpkeys kbd_mode netstat sh unicode_stop bsh echo kill nice sleep unlink cat ed ksh nisdomainname sort usleep chgrp egrep link pgawk stty vi chmod env ln ping su view chown ex loadkeys ping6 sync ypdomainname cp false login ps tar zcat cpio fgrep ls pwd tcsh csh gawk mail red touch cut gettext mailx rm tracepath date grep mkdir rmdir tracepath6 Regards. .... 'Good day Sir. 'I am trying to do LiveCD as described in Scientific Linux Live CD Page <http://linux.web.psi.ch/livecd/build.html> Yet i fail.... 'the system is running CentOs kernel 2.6.9-42.0.2.plus.c4smp 'with 8GB ram and two CPU's each Duo Core 64bit ' 'the error is nevertheless due to yum installation as described in your posted message. 'root at H-1 Build# yum -c $LIVE/etc/yum.conf --installroot=$LIVE install yum rootfiles shadow-utils \ '> bind-utils gnupg vim-enhanced vixie-cron crontabs passwd which kudzu dhclient \ '> pciutils eject alsa-utils mkisofs wget 'Setting up Install Process 'Setting up repositories 'not using ftp, http[s], or file for repos, skipping - Null is not a valid release or hasnt been released yet 'Cannot find a valid baseurl for repo: update 'Error: Cannot find a valid baseurl for repo: update 'root at H-1 Build# 'Regards 'Faysal Banna 'Meteorological Services 'Rafic Hariri International Airport 'Beirut - Lebanon 'Phone +961-1-628160 ' +961-3-258043 '