I finally tried rebooting the affected server, and as I expected it
wouldn't boot with 'no bootable device available', and I was able to
recover it by upgrading (admittedly ancient) BIOS (EFI) to the latest
available version.
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More information on the server affected by this bug:
product: Dell PowerEdge R320
capabilities: smbios-2.7 dmi-2.7 smp vsyscall32
firmware version: 2.4.2 date: 01/29/2015
CPU: Intel(R) Xeon(R) CPU E5-1410 0 @ 2.80GHz
boot in UEFI, but without secure boot
uname -a
Linux carte-fh 5.0.0-37-generic
The error comes from the impossibility for "efibootmgr" to create a new boot
UEFI entry
# efibootmgr --disk /dev/sda --part 1 --create --label "ubuntu" --loader
"\EFI\ubuntu\shmix64.efi"
Could not prepare Boot variable: Invalid argument
** Package changed: grub2-signed (Ubuntu) => efibootmgr
I am affected by this bug on a server Dell PowerEdge R320 with Ubuntu
18.04 LTS.
Unable to create EFI entry with efibootmgr.
If my server reboots, I know it will not be able to restart.
Watch the screenshot of my attempts to create a UEFI entry with
efibootmgr --disk /dev/sda --part 1 --create
I am/was affected by this bug (or at least the same symptoms) on a Dell
XPS 13 9343. It got resolved by updating the BIOS from version A15 to
version A20. I got the idea from reading the comments at
https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1753518,
which may be related to this.
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: grub2-signed (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1855574
** Summary changed:
- grub-efi-amd64-signed (1.93.15+2.02-2ubuntu8.14) failed to upgrade
+ grub-efi-amd64-signed (1.93.15+2.02-2ubuntu8.14) failed to upgrade, system
unbootable
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