I did the August update, and ran grub-install as advised. Upon re-booting I get ‘grub_calloc not found’.
So I fired up a live boot and did:
grub-install --target=i386-pc --recheck /dev/sdb
Everything ran perfectly, but on re-boot I get the same error.
I have no EFI partition on my boot disk, so it must be an MBR-BIOS system. What am I doing wrong?