Hi All, first of all, thanks for the help. > If you just want to switch a running system, I *think* this would be all > you need to do. > > 1 - Point Yum to look at SL yum repositories > 1a - rm -f /etc/yum.repos.d/*repo > (a bit drastic, but if you want to go slow, just move everything) > 1b (SL4) - rpm -Uvh > http://ftp.scientificlinux.org/linux/scientific/4x/i386/misc/RPMS/yum-conf-latest.SL.noarch.rpm Done. > 2 - Replace the following packages: > yum (from centos) -> yum (from SL) > centos-release -> sl-release > centos-release-notes -> sl-release-notes (SL5 Only) I cannot seem to install yum: I get dependency errors: ================ # rpm -i yum-2.4.3-10.SL.noarch.rpm warning: yum-2.4.3-10.SL.noarch.rpm: V3 DSA signature: NOKEY, key ID 82fd17b2 error: Failed dependencies: python-elementtree is needed by yum-2.4.3-10.SL urlgrabber is needed by yum-2.4.3-10.SL ================ So I attempt to follow the dependency trail, and end up stalled at: ================ # rpm -i yum-2.4.3-10.SL.noarch.rpm python-2.3.4-14.7.el4.i386.rpm python-elementtree-1.2.6-4.i386.rpm urlgrabber-2.9.6-1.noarch.rpm warning: yum-2.4.3-10.SL.noarch.rpm: V3 DSA signature: NOKEY, key ID 82fd17b2 warning: python-elementtree-1.2.6-4.i386.rpm: V3 DSA signature: NOKEY, key ID a7048f8d error: Failed dependencies: libdb-4.2.so is needed by python-2.3.4-14.7.el4 ================ As far as I can tell, libdb-4.2 is provided by the package compat-db in SL5, however, the latest version in SL4 is < 4.2... (I am attempting to convert to SL4) Am I missing something here? Previously I had converted this system from EL4 to Centos4 - might this have something to do with it? Thanks again! -Chris