I reran the update-notifier test that failed with grub error in xenial with the new grub added as trigger, and it installed now, so it's good to go :D
Unpacking grub-efi-arm64 (2.04-1ubuntu44) over (2.02~beta2-36ubuntu3.29) ...
Preparing to unpack .../grub-efi-arm64-bin_2.04-1ubuntu44_arm64.deb ...
Unpacking grub-efi-arm64-bin (2.04-1ubuntu44) over (2.02~beta2-36ubuntu3.29) ...
Preparing to unpack .../grub2-common_2.02~beta2-36ubuntu3.32_arm64.deb ...
Unpacking grub2-common (2.02~beta2-36ubuntu3.32) over (2.02~beta2-36ubuntu3.29) ...
Preparing to unpack .../grub-common_2.02~beta2-36ubuntu3.32_arm64.deb ...
Unpacking grub-common (2.02~beta2-36ubuntu3.32) over (2.02~beta2-36ubuntu3.29) ...
Selecting previously unselected package grub-efi-arm64-signed.
Preparing to unpack .../grub-efi-arm64-signed_1.167~16.04.1+2.04-1ubuntu44_arm64.deb ...
Unpacking grub-efi-arm64-signed (1.167~16.04.1+2.04-1ubuntu44) ...
Processing triggers for install-info (6.1.0.dfsg.1-5) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for systemd (229-4ubuntu21.31) ...
Setting up python-apt-common (1.1.0~beta1ubuntu0.16.04.12) ...
Setting up python3-apt (1.1.0~beta1ubuntu0.16.04.12) ...
Setting up grub-common (2.02~beta2-36ubuntu3.32) ...
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
Setting up grub-efi-arm64-bin (2.04-1ubuntu44) ...
Setting up grub2-common (2.02~beta2-36ubuntu3.32) ...
Setting up grub-efi-arm64 (2.04-1ubuntu44) ...
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-4.4.0-210-generic
Found initrd image: /boot/initrd.img-4.4.0-210-generic
Adding boot menu entry for EFI firmware configuration
done
Setting up grub-efi-arm64-signed (1.167~16.04.1+2.04-1ubuntu44) ...
Installing for arm64-efi platform.
Installation finished. No error reported.
Reading package lists...
Building dependency tree...
Reading state information...
I reran the update-notifier test that failed with grub error in xenial with the new grub added as trigger, and it installed now, so it's good to go :D
Unpacking grub-efi-arm64 (2.04-1ubuntu44) over (2.02~beta2- 36ubuntu3. 29) ... efi-arm64- bin_2.04- 1ubuntu44_ arm64.deb ... 36ubuntu3. 29) ... common_ 2.02~beta2- 36ubuntu3. 32_arm64. deb ... 36ubuntu3. 32) over (2.02~beta2- 36ubuntu3. 29) ... common_ 2.02~beta2- 36ubuntu3. 32_arm64. deb ... 36ubuntu3. 32) over (2.02~beta2- 36ubuntu3. 29) ... arm64-signed. efi-arm64- signed_ 1.167~16. 04.1+2. 04-1ubuntu44_ arm64.deb ... arm64-signed (1.167~ 16.04.1+ 2.04-1ubuntu44) ... beta1ubuntu0. 16.04.12) ... beta1ubuntu0. 16.04.12) ... 36ubuntu3. 32) ... 36ubuntu3. 32) ... 4.4.0-210- generic img-4.4. 0-210-generic arm64-signed (1.167~ 16.04.1+ 2.04-1ubuntu44) ...
Preparing to unpack .../grub-
Unpacking grub-efi-arm64-bin (2.04-1ubuntu44) over (2.02~beta2-
Preparing to unpack .../grub2-
Unpacking grub2-common (2.02~beta2-
Preparing to unpack .../grub-
Unpacking grub-common (2.02~beta2-
Selecting previously unselected package grub-efi-
Preparing to unpack .../grub-
Unpacking grub-efi-
Processing triggers for install-info (6.1.0.dfsg.1-5) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for systemd (229-4ubuntu21.31) ...
Setting up python-apt-common (1.1.0~
Setting up python3-apt (1.1.0~
Setting up grub-common (2.02~beta2-
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
Setting up grub-efi-arm64-bin (2.04-1ubuntu44) ...
Setting up grub2-common (2.02~beta2-
Setting up grub-efi-arm64 (2.04-1ubuntu44) ...
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-
Found initrd image: /boot/initrd.
Adding boot menu entry for EFI firmware configuration
done
Setting up grub-efi-
Installing for arm64-efi platform.
Installation finished. No error reported.
Reading package lists...
Building dependency tree...
Reading state information...