systemd targets vs runlevels on a VPS
systemd targets replaced runlevels, and the old numbers survive only as aliases. See what a target really is, and how to change what your VPS boots into.
#boot
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Pin which kernel your VPS boots next
GRUB_DEFAULT does nothing on an Ubuntu cloud image. Read the menu entries your server really has, then pin the next boot without risking a rescue console.
VPS will not boot after a kernel update
Recover a headless server that fails to boot after a kernel upgrade: provider console, GRUB previous kernel, initramfs and LVM failures, and prevention.