Hi, I tested SL 6.9 x86_64 with netimage [http://ftp.scientificlinux.org/linux/scientific/6rolling/x86_64/iso/SL-6-x86_64-netinstall.iso] you gave us. Installation was on libvirt/qemu/kvm. Installation process went as follow: 1) Test disc - OK 2) Select default options for network configuration in URL submenu 3) Put url http://ftp.scientificlinux.org/linux/scientific/6rolling/x86_64/os/ 4) Wait for retrieving install.img etc... 5) Wait for graphical installer. Next -> Install anyway (alpha/beta infobox). 6) Hostname sl69 6) Basic Storage Devices 7) Zone - Warsaw, then set root pass. 8) Use All Space twice, on third try I made manual partitioning. 9) Customize now -> Install all package group except language support, without adding optional packages in any group. 10) Install 11) There is error - "libguestfs-1.20.11-20.el6.x86_64.rpm cannot be opened. This is due to a missing file, a corrupt package or corrupt media. Please verify your installation source." Screenshot included. I tried on 3 different installation, (one with only 20 gb of disc space, so I make it bigger 40 gb, when same package had problem I thought that, this might be bug, but to be sure I made 50 gb installation with manual partitioning, same result) I would love to hear if anyone else can reproduce. Bests Alex