fix grub after upgrade from jessie to stretch

After the upgrade from Jessie to Stretch, GRUB started throwing the following error:

error: no symbol table.
Press any key to continue...

If I pressed any key or didn’t press anything at all, system would boot normally after a few seconds. Still, the error message bothered me, so I fixed it by using the solution proposed here.

In my case the Linux drive is sda, so I ran the following commands:

grub-install /dev/sda

and all was good again.

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