Go to Advanced options in Grub menu. Select the kernel version you want to boot into. This will activate the kernel you want to make active. Then go to Update Manager > View > Linux Kernels.

How do I revert to a previous kernel in Linux Mint?

Re: How to change/revert to previous kernels? Hold shift during boot to show the GRUB menu, if not shown by default. Use arrow keys to scroll down to the older kernel version.

How do I boot into a new kernel?

Hold down SHIFT to display the menu during boot. In certain cases, pressing the ESC key may also display the menu. You should now see the the grub menu. Use the arrow keys to navigate to the advanced options and choose the kernal you want to boot.