Dear Maintainer,

At the end of the Debian installation, the installation of the Grub package
fails.

I first found this bug with the Debian 12.0 installer in september, but it is
still present in 12.4. My goal is to install a Debian with full disk
encryption, I just let the Debian Installer configure everything to use my
whole disk and create needed partitions. The installation performs well, but at
the end Grub is not installed. I got the message "Unable to install GRUB into
dummy". You can see in this capture the whole error messages:
https://pic.infini.fr/gallery#0aTFatc6/ALzRXAY9.png

I tried an installation without encryption and get the same error. I got this
error with Linux Mint too, but I managed to repair Grub after the installation
(only /home encryption). I did not manage to repair GRUB manually with Debian
and full disk encryption, and I didn't try without the encryption.

The PC is an Asus Expertbook B9400C. The BIOS is up to date (2023-12-12) and it
can only boot on EFI. The SSD is in GPT mode and all partitions were made using
the "automatic" mode. I used a USB drive made by the Linux Mint tool (which is
basically a GUI for dd).

Feel free to ask me more information. As I need this PC for the work, I will
reinstall Linux Mint if I didn't find a solution until the 2 of january (After
that date I will be unable to perform more tests and risk to lose my system)

PS: I write this report on another PC, the system information section is
written by Reportbug and is wrong

Hi Ludovic,

OK, thanks for sharing the picture of your syslog. The information
there (lines 3 and 4) says what the problem is - the EFI variable
space on your system is full. See

https://wiki.debian.org/UEFI#Firmware_has_run_out_of_space_to_write_boot_variables

for more information about this. Does this machine have a lot of files
in /sys/fs/pstore, by any chance?

Also see <https://lists.debian.org/debian-user/2024/06/msg00204.html>.
It looks like a thorny problem. Hat tip to Hans for figuring it out.

Jeff