How to Install Latest Kernel in Ubuntu, Linux Mint
Ubuntu releases (including LTS) and Linux Mint usually ships stable mainline Linux Kernel, whichever is available before the change freeze during the development phase. Ubuntu short-term releases feature almost the latest Kernel. The long-term version of Ubuntu and Linux Mint offers the mainline LTS Kernel. The LTS Kernel usually is pretty old and doesn't support the latest fixes and hardware support.
Hence, you may want to take advantage of the latest mainline Kernel without hampering your current Ubuntu or Linux Mint installation.
But installing the latest Kernel by replacing the current distro-provided one is risky. If you are sure what you are doing, then you can follow the below steps.