Which version of ubuntu is this?
How did you check that it points to an unsigned image?
You can use:
sbattach --detach /tmp/signature /vmlinuz && ls -la /tmp/signature
To check if there is signature present in the vmlinuz.
** Changed in: grub2 (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1170150
Title:
vmlinuz/initrd.img symlinks do not point to signed versions on kernel
updates of secure boot UEFI machines
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