Your currently installed kernel is the 6.16.9-1-liquorix-amd64, which is a Liquorix custom kernel variant. Liquorix kernels often have different configurations and may not fully support certain security features, like the AppArmor filesystem, or may disable them for performance or compatibility reasons.

What this means for your case:
Your Liquorix kernel does enable AppArmor module, but likely lacks AppArmor filesystem support (CONFIG_SECURITY_APPARMOR_FS), which is crucial for AppArmor service activation.

Ubuntu 25.04 official generic kernels generally include full AppArmor filesystem support, necessary for the service to run correctly.

Running Docker Desktop on Liquorix kernel thus may fail due to AppArmor service never activating since its filesystem cannot be properly mounted.
Several user reports indicate Liquorix or other custom kernels may disable or lack CONFIG_SECURITY_APPARMOR_FS, needed for mounting /sys/kernel/security/apparmor and enabling systemd AppArmor service.

please can you check if that is the case?
kind regards :)
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Is that some AI output that you're trusting? There isn't a kernel config named CONFIG_SECURITY_APPARMOR_FS.

You can turn on AppArmor by using a kernel boot parameter. I recommend looking here for help on that: wiki.archlinux.org/title/AppArmor
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