$ dpkg -l | awk '$2 ~ /grub/ {print$2}' | grep -v gfx | xargs sudo apt-get -y install --reinstall
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  wireless-regdb nvidia-settings-319 crda
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 4 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0 B/3,178 kB of archives.
After this operation, 0 B of additional disk space will be used.
Preconfiguring packages ...
(Reading database ... 432917 files and directories currently installed.)
Preparing to replace grub-common 1.99-21ubuntu3.18 (using .../grub-common_1.99-21ubuntu3.18_amd64.deb) ...
Unpacking replacement grub-common ...
Preparing to replace grub-pc 1.99-21ubuntu3.18 (using .../grub-pc_1.99-21ubuntu3.18_amd64.deb) ...
Unpacking replacement grub-pc ...
Preparing to replace grub-pc-bin 1.99-21ubuntu3.18 (using .../grub-pc-bin_1.99-21ubuntu3.18_amd64.deb) ...
Unpacking replacement grub-pc-bin ...
Preparing to replace grub2-common 1.99-21ubuntu3.18 (using .../grub2-common_1.99-21ubuntu3.18_amd64.deb) ...
Unpacking replacement grub2-common ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
Processing triggers for install-info ...
Setting up grub-common (1.99-21ubuntu3.18) ...
Setting up grub2-common (1.99-21ubuntu3.18) ...
Setting up grub-pc-bin (1.99-21ubuntu3.18) ...
Setting up grub-pc (1.99-21ubuntu3.18) ...
Installation finished. No error reported.
Generating grub.cfg ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found memtest86+ image: /memtest86+.bin
done