I'm seeing the same error.

$ sudo apt dist-upgrade 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
Setting up grub-efi-amd64-signed (1.93.13+2.02-2ubuntu8.12) ...
Installing for x86_64-efi platform.
File descriptor 4 (/dev/sdb1) leaked on vgs invocation. Parent PID 16086: 
grub-install
File descriptor 4 (/dev/sdb1) leaked on vgs invocation. Parent PID 16086: 
grub-install
Could not prepare Boot variable: No space left on device
grub-install: error: efibootmgr failed to register the boot entry: Input/output 
error.
dpkg: error processing package grub-efi-amd64-signed (--configure):
 installed grub-efi-amd64-signed package post-installation script subprocess 
returned error exit status 1
dpkg: dependency problems prevent processing triggers for shim-signed:
 shim-signed depends on grub-efi-amd64-signed; however:
  Package grub-efi-amd64-signed is not configured yet.

dpkg: error processing package shim-signed (--configure):
 dependency problems - leaving triggers unprocessed
Errors were encountered while processing:
 grub-efi-amd64-signed
 shim-signed
needrestart is being skipped since dpkg has failed
E: Sub-process /usr/bin/dpkg returned an error code (1)

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https://bugs.launchpad.net/bugs/1753518

Title:
  package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 1

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