At 05:01 PM 8/4/2020, you wrote: >Am 05.08.20 um 01:27 schrieb david: >>At 04:18 PM 8/4/2020, you wrote: >>>Am 05.08.20 um 01:09 schrieb david: >>>>At 01:54 PM 8/4/2020, you wrote: >>>>>On Tue, 04 Aug 2020 13:44:05 -0700 >>>>>david wrote: >>>>> >>>>> > After all the updates, the system was NOT bootable. >>>>> >>>>>How long did you wait for it to boot, and >>>>>what did it do when it failed to >>>>>boot? What text messages showed up on >>>>>the console? Any reported errors when >>>>>you ran the update or when you rebooted the >>>>>computer? If so, what did the say? >>>>> >>>>>I personally haven't had any issues updating >>>>>any of my computers (using a mix of Centos >>>>>6, 7 and 8) but maybe they're all too old to for the issue to show up. >>>>> >>>>>-- >>>>How long did I wait: 5 minutes >>>>What on the console: nothing, just a dull gray color >>>>Errors on update: none >>>>--------------------- >>>>But when I blocked the update, it booted within a minute, and ran. >>> >>>Can you boot the system with all updates and secureboot=off? >>>(Just to be sure; I imply that you use UEFI, right?) >>> >>>-- >>>Leon >>>____________ >> >>I'm not sure how to turn 'secure boot' off or if it exists. >>(MacMini5.2). I presume it uses UEFI, but not sure how to answer that. > >Oh, an apple device. AFAIK the openfirmware of >such hardware have also a legacy mode. So first >check if it uses the UEFI mode at all by checking >if this directory exists (in the working/bootable system): > ># ls -la /sys/firmware/efi > >if so test the secure boot state with > ># mokutil --sb-state > > >>Boot failure only occurs when the grub2/shim/mokutil updates are applied. [root at xxx -]ls -la /sys/firmware/efi total 0 drwxr-xr-x 5 root root 0 Aug 4 17:12 . drwxr-xr-x 7 root root 0 Aug 4 14:30 .. -r--r--r-- 1 root root 4096 Aug 4 17:12 config_table drwxr-xr-x 2 root root 0 Aug 4 14:30 efivars -r--r--r-- 1 root root 4096 Aug 4 17:12 fw_platform_size -r--r--r-- 1 root root 4096 Aug 4 17:12 fw_vendor -r--r--r-- 1 root root 4096 Aug 4 17:12 runtime drwxr-xr-x 10 root root 0 Aug 4 17:12 runtime-map -r-------- 1 root root 4096 Aug 4 14:31 systab drwxr-xr-x 23 root root 0 Aug 4 17:12 vars [root at xxx ~]# mokutil --sb-state This system doesn't support Secure Boot [root at xxx ~]#