Public bug reported: When secure boot is enabled on an EFI system, it is not possible to display background images in TGA format because the tga module is not pre-loaded by the signed grubx64.efi binary and it is not possible to insmod the module in a secure boot environment.
The jpeg and png modules are pre-loaded and it is possible to display background images in those formats. Since the backgrounds in the grub2-splashimages package are distributed as TGA images I believe this should be considered a bug. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: grub-efi-amd64-signed 1.93+2.02-2ubuntu8 ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17 Uname: Linux 4.15.0-20-generic x86_64 ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 CurrentDesktop: KDE Date: Fri May 4 11:51:07 2018 InstallationDate: Installed on 2018-05-02 (1 days ago) InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) SourcePackage: grub2-signed UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: grub2-signed (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1769011 Title: The signed binary grubx64.efi does not include the tga module To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1769011/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs