I checked and secure boot is turned off. Jonathan brings it exactly to the point: we have to face UEFI because legacy mode is fading out, if I enable legacy mode I can't even boot anymore through the network (PXE) as these newer network cards can only boot PXE with UEFI. In the mean time I have installed Ubuntu 17.10 with Xen and I was lucky to see that this combination works with UEFI even Xen. On Wed, Jan 31, 2018 at 2:12 PM, Johnny Hughes <johnny at centos.org> wrote: > On 01/30/2018 04:23 PM, John Naggets wrote: >> Hi, >> >> I installed CentOS 7.4 on a modern Lenovo ThinkSystem SR630 server >> which uses UEFI. So far so good CentOS 7.4 works fine so then I went >> on to install the Xen hypervisor by following the instructions from >> the wiki (https://wiki.centos.org/HowTos/Xen/Xen4QuickStart). >> >> Unfortunately when I reboot after having installed the xen package the >> system does not boot into "CentOS Linux, with Xen hypervisor" from the >> grub menu prompt. I get the following error: >> >> Loading Xen 4.6.6-8.el7 ... >> error: can't find command `multiboot'. >> Loading Linux 4.9.75-29.el7.x86_64 ... >> error: can't find command `module'. >> Loading initial ramdisk ... >> error: can't find command `module'. >> >> Press any key to continue... >> >> The problem which I encounter here is exactly the same issue as >> described for Fedora in the RedHat bugs: >> https://bugzilla.redhat.com/show_bug.cgi?id=1286317 with the exception >> that for me it's CentOS 7.4 and that the workarounds as described in >> that bug do not work. >> >> Does anyone know how I can make my CentOS boot with the Xen hypervisor >> using UEFI? >> >> Thank you very much for your help. >> > > Usually not an issue with UEFI .. but with Secure Boot > > You need to make sure Secure Boot is off. It is sometimes called Legacy > Booting turned on, etc. > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos >