Hi,
I experienced the same today after a grub update to '2.02+dfsg1-1' on testing.
Looking back at logs, grub-install reported an error but the upgrade process
as a whole didn't fail, so I missed it at first:
```
Could not prepare Boot variable: No space left on device
grub-install: error: efibootmgr failed to register the boot entry: Input/output 
error.
Failed: grub-install --target=x86_64-efi  
WARNING: Bootloader is not properly installed, system may not be bootable
```

However, after manually recovering via efibootmgr, the ESP doesn't seem
to be full nor close to:
```
# df -h
Filesystem              Size  Used Avail Use% Mounted on
/dev/sda4               3.7G  238M  3.2G   7% /boot
/dev/sda1               256M   24M  233M  10% /boot/efi
```

My pstore has ~150 entries, all quite small (~1Kb), and none of them are recent.
So I'm not sure why this specific upgrade got stuck on ENOSPC.

Ciao, Luca

-- 
"If you build a wall, think of what you leave outside it" - Italo Calvino

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