Also affects my desktop Ubuntu 18.04.4 LTS. Took me ages because the original 
desktop boot disk for bionic just gave a blank monitor but here is a fix:
I downloaded the boot/repair iso 
(https://sourceforge.net/projects/boot-repair-cd/) and created a bootable USB 
disk with the startup disk creator on another Linux box.
Then I did a manual grub re-install via the terminal (didn't use the one-click 
rescue of the ISO):
sudo -s
mount /dev/sdaX /mnt
grub-install --boot-directory=/mnt/boot /dev/sda

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https://bugs.launchpad.net/bugs/1889509

Title:
  grub boot error : "symbol 'grub_calloc' not found

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