Bug#984520: error : symbol 'grub_register_command_lockdown' not found

[ka]

Hi,

I am using Buster and start the computer in BIOS mode.
After installing the security updates of grub2 (4 files; 2.02+dfsg1-20+deb10u4) 
the computer didn't boot any more and I got the same error message as 
described in bug #984520.

With the help of Super Grub 2.02 I could start the laptop and reinstalled 
old grub2 (4 files; 2.02+dfsg1-20+deb10u3). Then it booted as usual.

Afterwards I installed grub-rescue-pc (2.02+dfsg1-20+deb10u4) and burned the 
image on CD.

I tried to boot the PC with this CD but it failed with:
mounting /dev on /root/dev failed: not such file or directory 
and several more error messages.

What made me warily was the fact that only sda has been mounted.
On sda grub is not installed on my computer.
I installed it on sdb. So it could not find the boot files and booting failed.

sudo debconf-show grub-pc

* grub2/linux_cmdline_default: quiet
  grub2/kfreebsd_cmdline:
  grub-pc/hidden_timeout: false
  grub-pc/disk_description:
  grub-pc/kopt_extracted: false
  grub-pc/postrm_purge_boot_grub: false
  grub2/device_map_regenerated:
  grub-pc/install_devices_disks_changed:
  grub-pc/chainload_from_menu.lst: true
  grub-pc/install_devices_failed: false
* grub2/linux_cmdline:
  grub-pc/timeout: 5
  grub2/update_nvram: true
  grub-pc/mixed_legacy_and_grub2: true
  grub2/force_efi_extra_removable: false
  grub-pc/install_devices_empty: false
  grub2/kfreebsd_cmdline_default: quiet
* grub-pc/install_devices: /dev/disk/by-id/ata-WDC_WD10JPVX-60JC3T0_WD-
WX71A858X5KH
  grub-pc/install_devices_failed_upgrade: true
  grub-pc/partition_description:


 ls -l /dev/disk/by-id/

insgesamt 0
lrwxrwxrwx 1 root root  9 Mär  5 16:38 ata-hp_DVDRW_SU208GB_S16F6YIG901G9X -> 
../../sr0
lrwxrwxrwx 1 root root  9 Mär  5 16:38 ata-Samsung_SSD_860_EVO_M.
2_500GB_S414NB0K906860K -> ../../sdb
lrwxrwxrwx 1 root root 10 Mär  5 16:38 ata-Samsung_SSD_860_EVO_M.
2_500GB_S414NB0K906860K-part1 -> ../../sdb1
lrwxrwxrwx 1 root root 10 Mär  5 16:38 ata-Samsung_SSD_860_EVO_M.
2_500GB_S414NB0K906860K-part2 -> ../../sdb2
lrwxrwxrwx 1 root root 10 Mär  5 16:38 ata-Samsung_SSD_860_EVO_M.
2_500GB_S414NB0K906860K-part3 -> ../../sdb3
lrwxrwxrwx 1 root root 10 Mär  5 16:38 ata-Samsung_SSD_860_EVO_M.
2_500GB_S414NB0K906860K-part5 -> ../../sdb5
lrwxrwxrwx 1 root root 10 Mär  5 16:38 ata-Samsung_SSD_860_EVO_M.
2_500GB_S414NB0K906860K-part6 -> ../../sdb6
lrwxrwxrwx 1 root root 10 Mär  5 16:38 ata-Samsung_SSD_860_EVO_M.
2_500GB_S414NB0K906860K-part7 -> ../../sdb7
lrwxrwxrwx 1 root root  9 Mär  5 16:38 ata-WDC_WD10JPVX-60JC3T0_WD-
WX71A858X5KH -> ../../sda
lrwxrwxrwx 1 root root 10 Mär  5 16:38 ata-WDC_WD10JPVX-60JC3T0_WD-
WX71A858X5KH-part1 -> ../../sda1
lrwxrwxrwx 1 root root  9 Mär  5 16:38 wwn-0x50014ee60612880e -> ../../sda
lrwxrwxrwx 1 root root 10 Mär  5 16:38 wwn-0x50014ee60612880e-part1 -> ../../
sda1
lrwxrwxrwx 1 root root  9 Mär  5 16:38 wwn-0x5002538e407c123b -> ../../sdb
lrwxrwxrwx 1 root root 10 Mär  5 16:38 wwn-0x5002538e407c123b-part1 -> ../../
sdb1
lrwxrwxrwx 1 root root 10 Mär  5 16:38 wwn-0x5002538e407c123b-part2 -> ../../
sdb2
lrwxrwxrwx 1 root root 10 Mär  5 16:38 wwn-0x5002538e407c123b-part3 -> ../../
sdb3
lrwxrwxrwx 1 root root 10 Mär  5 16:38 wwn-0x5002538e407c123b-part5 -> ../../
sdb5
lrwxrwxrwx 1 root root 10 Mär  5 16:38 wwn-0x5002538e407c123b-part6 -> ../../
sdb6
lrwxrwxrwx 1 root root 10 Mär  5 16:38 wwn-0x5002538e407c123b-part7 -> ../../
sdb7

Regards
Dieter