Public bug reported:
Hello and thanks for maintaining grub in Ubuntu.
We've been using grub EFI boot loader in Bionic and Focal official cloud
images. After upgrading grub packages from 2.02-2ubuntu8.14 to
2.02-2ubuntu8.17 we are having trouble with console display (provided by
QEMU VNC) as it is scrambled and unreadable. See attached screenshot.
We have noticed that the problem manifests itself when terminal_output
is set to "gfxterm" but is not present when set to "console".
Additionally we verified that in Bionic the problem manifests itself
with boot loader provided by 1.93.19+2.02-2ubuntu8.17 (sha1sum:
7be316b0542921956dc3742d70b26e409ca83ef0
/boot/efi/EFI/BOOT/grubx64.efi) while the boot loader provided by
1.93.15+2.02-2ubuntu8.14 (sha1sum:
2895a67157d97b0d3825987639d817a08aad3da8 /boot/efi/EFI/BOOT/grubx64.efi)
works just fine.
Problem manifests itself in Focal hosts as well featuring grub-efi-
amd64-signed version 1.142.4+2.04-1ubuntu26.2.
Boot loader and related files are installed by grub in
/boot/efi/EFI/BOOT/ during the image creation like this:
```
grub-install --boot-directory=/boot --efi-directory=/boot/efi
--target=x86_64-efi --removable --uefi-secure-boot --no-nvram
```
said invocation among other things does copy files provided by
grub-efi-amd64-signed package:
```
grub-install: info: copying `/usr/lib/grub/x86_64-efi-signed/gcdx64.efi.signed'
-> `/boot/efi/EFI/BOOT/grubx64.efi'.
grub-install: info: copying `/usr/lib/shim/shimx64.efi.signed' ->
`/boot/efi/EFI/BOOT/BOOTX64.EFI'.
grub-install: info: copying `/usr/lib/shim/mmx64.efi' ->
`/boot/efi/EFI/BOOT/mmx64.efi'.
grub-install: info: copying `/usr/lib/shim/BOOTX64.CSV' ->
`/boot/efi/EFI/BOOT/BOOTX64.CSV'.
grub-install: info: copying `/boot/grub/x86_64-efi/load.cfg' ->
`/boot/efi/EFI/BOOT/grub.cfg'.
```
A naive experimentation, swapping the old boot loader in place of the
newer, restores display back to normal.
We will be happy to provide more details if needed.
** Affects: grub2-signed (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Screenshot_2020-08-27_17-20-38.png"
https://bugs.launchpad.net/bugs/1893227/+attachment/5405198/+files/Screenshot_2020-08-27_17-20-38.png
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https://bugs.launchpad.net/bugs/1893227
Title:
Scrambled display with newer grubx64.efi bootloader and
terminal_output gfxterm
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