Do You have Secure Boot activated? If yes, turn it off. and try it agian. How did You want to install a newer Kernel? Here is a Guide with several Possibilities:
Updated as of Mar 28 2025
To install the Mainline Installer:
add the repository:
sudo add-apt-repository ppa:cappelikan/ppa
Update sources and install:
sudo apt update && sudo apt install mainline
Launch Mainline from App Menu or terminal, and select the kernel you wish to test.
To use TuxInvader Kernel:
These are not Microsoft signed, so Secure Boot must be disabled in BIOS Settings.
Add repository:
If using Zorin OS 16:
sudo add-apt-repository ppa:tuxinvader/lts-mainline
If usi…