Public bug reported:
Hello,
I'm trying to deploy an Ubuntu Server on arm64 with securbeoot and UKIs.
I'm running into the problem that the shipped kernel is just a plain gzip
compressed version of the kernel image.
This causes two issues:
- sbsign refuses to sign the kernel without uncompressing
The first failure can be easily reproduced by trying to sign vmlinuz,
The second one by using mkosi (https://github.com/systemd/mkosi):
```
$ mkosi genkey
$ mkosi --distribution=ubuntu --architecture=arm64 --release=noble -p
linux-image-generic,systemd,systemd-sysv,udev,dbus,systemd-boot
--qemu-f
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