On 8/1/20 5:00 AM, Johnny Hughes wrote: > > I would wait and install everything as a group. We should have > something soon. First off, Johnny and all of the rest of the CentOS team, thank you for your efforts! Second, to all with this problem, I too experienced the issue (I posted on the CentOS-Devel list my findings). To those who seem to think more testing could have prevented the issue, let me just say that while the FIRST update to the new shim-x64, grub2, and kernel stack failed for me (and that update was done with the GUI updater that reboots for the actual update), I WAS able to recover using the install media's rescue mode tools as documented in my posts on CentOS-devel. I'm glad to provide any and all logs of the processes I did, but the short of it is that after I successfully downgraded grub2 it still wouldn't boot, but I was able to do a reinstall of grub2 (81, the older version) to get it to boot with the old grub2, the new shim-x64, and the new kernel, and then I was able to successfully update grub2 with dnf on a command line. So I have the following installed: [lowen at localhost ~]$ rpm -q shim-x64 shim-x64-15-13.el8.x86_64 [lowen at localhost ~]$ rpm -qa | grep ^grub2 grub2-common-2.02-87.el8_2.noarch grub2-tools-2.02-87.el8_2.x86_64 grub2-efi-x64-2.02-87.el8_2.x86_64 grub2-tools-extra-2.02-87.el8_2.x86_64 grub2-pc-2.02-87.el8_2.x86_64 grub2-tools-efi-2.02-87.el8_2.x86_64 grub2-tools-minimal-2.02-87.el8_2.x86_64 grub2-pc-modules-2.02-87.el8_2.noarch grub2-efi-x64-modules-2.02-87.el8_2.noarch [lowen at localhost ~]$ rpm -qa | grep ^kernel|grep 147 kernel-devel-4.18.0-147.8.1.el8_1.x86_64 kernel-4.18.0-147.8.1.el8_1.x86_64 kernel-modules-4.18.0-147.8.1.el8_1.x86_64 kernel-core-4.18.0-147.8.1.el8_1.x86_64 [lowen at localhost ~]$ And this is on a machine that previously crashed during boot with the exactly the same packages. So even on the same hardware the same update (done a bit differently) had different results. It's quite possible, based on my experience with this particular issue, that if I had the whole system rolled back to where it was before the GUI update and if I then updated it again that it could just simply work ok afterwards. It's very hard to test for intermittent issues!