Could not prepare Boot variable

[Christophe Pisteur <christophe.pisteur@fsfe.org>]

Hello, 

On my guix system, I did a simple guix pull then sudo guix system
reconfigure /etc/config.scm but at the end of the process, when
updating the boot loader, the following message appears in the console:

construction de /gnu/store/15g01mbkxmjhy5fbl1cnwazf5bs4p5yl-install-
bootloader.scm.drv...
guix system: erreur : '/gnu/store/b923c23w9qr185xk40392434dm85wd72-
grub-efi-2.12/sbin/grub-install --bootloader-id=Guix --boot-directory
//boot --efi-directory //boot/efi' exited with status 1; output
follows:

Installation pour la plate-forme x86_64-efi.
Could not prepare Boot variable: No space left on device
/gnu/store/b923c23w9qr185xk40392434dm85wd72-grub-efi-2.12/sbin/grub-
install : erreur : efibootmgr n'a pas réussi à enregistrer l'entrée de
démarrage: Erreur d'entrée/sortie.

I checked my partitions, which all have enough free space:
/boot/efi               14% occupied space
/                                39% occupied space
/gnu/store           39% occupied space

Note that I'm dual-boot with ubuntu (24.10), but I hardly ever use this
partition. 

Any idea to help me?

Christophe