Installation/Signing not working on Ubuntu 24 LTS

[webloft]

Running the install script outputs:

# sudo ./install.sh

Secure Boot not enabled on this system.
Creating symlink /var/lib/dkms/acpi_ec/1.0.4/source -> /usr/src/acpi_ec-1.0.4
Sign command: /usr/bin/kmodsign
Signing key: /var/lib/shim-signed/mok/MOK.priv
Public certificate (MOK): /var/lib/shim-signed/mok/MOK.der

Building module:
Cleaning build area...
make -j4 KERNELRELEASE=6.8.0-101-generic -C /lib/modules/6.8.0-101-generic/build M=/var/lib/dkms/acpi_ec/1.0.4/build/src modules...
Signing module /var/lib/dkms/acpi_ec/1.0.4/build/src/acpi_ec.ko
Cleaning build area...

acpi_ec.ko.zst:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/6.8.0-101-generic/updates/dkms/
depmod...

Trying modprobe fails:

# sudo modprobe acpi_ec
modprobe: ERROR: could not insert 'acpi_ec': Operation not permitted

# sudo dmesg | grep acpi_ec
[  223.299090] acpi_ec: loading out-of-tree module taints kernel.
[  223.299106] acpi_ec: module verification failed: signature and/or required key missing - tainting kernel

Also uninstall.sh fails to remove the module - have to manually exec dkms uninstall/remove