SRU verification[*]:

ubuntu@dawes:~$ sudo efibootmgr  | grep ubuntu
ubuntu@dawes:~$ sudo debconf-show grub-efi-arm64 | grep update_nvram
  grub2/update_nvram: true
ubuntu@dawes:~$ sudo dpkg-reconfigure -pcritical grub-efi-arm64 
Installing for arm64-efi platform.
Installation finished. No error reported.
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-97-generic
Found initrd image: /boot/initrd.img-4.4.0-97-generic
Adding boot menu entry for EFI firmware configuration
done
ubuntu@dawes:~$ sudo efibootmgr  | grep ubuntu
Boot0000* ubuntu
ubuntu@dawes:~$ sudo efibootmgr -B -b 0000 > /dev/null


ubuntu@dawes:~$ echo debconf grub2/update_nvram boolean false | sudo 
debconf-set-selections 
ubuntu@dawes:~$ sudo debconf-show grub-efi-arm64 | grep update_nvram
* grub2/update_nvram: false
ubuntu@dawes:~$ sudo efibootmgr | grep ubuntu
ubuntu@dawes:~$ sudo dpkg-reconfigure -pcritical grub-efi-arm64 
Installing for arm64-efi platform.
Installation finished. No error reported.
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-97-generic
Found initrd image: /boot/initrd.img-4.4.0-97-generic
Adding boot menu entry for EFI firmware configuration
done
ubuntu@dawes:~$ sudo efibootmgr | grep ubuntu
ubuntu@dawes:~$

[*] Note: the arm64/amd64 builds are still stuck in "Unapproved" - I did
this verification by pulling the builds from LP directly


** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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https://bugs.launchpad.net/bugs/1642298

Title:
  Grub package upgrades overwrites NVRAM, causing MAAS boot order to be
  overwritten.

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