Change default kernel to LTS not ZEN

[BluishHumility]

You can change the default boot option by following the guidance here:

New Grub option GRUB_TOP_LEVEL

The latest grub update introduces a new feature, to explicitly select an entry of the installation (among linux, linux-lts, linux-zen, etc.) being at the top level of the menu. In case you use submenus, the selected entry is the one in the front/main page, while it is also at the top in the Advanced menu entries page. A user may wish to use an image that is not sorted as the “latest” version as the top-level entry. For example, in Arch Linux, if a user has the LTS and regular kernels installed…