Some approaches

## 0
From [how2shout](https://linux.how2shout.com/how-to-change-default-kernel-in-ubuntu-22-04-20-04-lts/)

Edit `/etc/default/grub` and set
```
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true
#GRUB_TIMEOUT=0
```

## 1
From [this github gist](https://gist.github.com/chaiyujin/c08e59752c3e238ff3b1a5098322b363)

Find the options
```bash
$ cd /boot/grub
grub$ grep option grub.cfg | sed -e "s/.*id_option '//" -e "s/'.*//"
gnulinux-simple-80fb29ca-9952-461c-a7de-fcf32e80a450
gnulinux-advanced-80fb29ca-9952-461c-a7de-fcf32e80a450
gnulinux-5.19.0-38-generic-advanced-80fb29ca-9952-461c-a7de-fcf32e80a450
gnulinux-5.19.0-38-generic-recovery-80fb29ca-9952-461c-a7de-fcf32e80a450
gnulinux-5.19.0-32-generic-advanced-80fb29ca-9952-461c-a7de-fcf32e80a450
gnulinux-5.19.0-32-generic-recovery-80fb29ca-9952-461c-a7de-fcf32e80a450
gnulinux-5.15.0-69-lowlatency-advanced-80fb29ca-9952-461c-a7de-fcf32e80a450
gnulinux-5.15.0-69-lowlatency-recovery-80fb29ca-9952-461c-a7de-fcf32e80a450
```
so we want `gnulinux-5.15.0-69-lowlatency-advanced-80fb29ca-9952-461c-a7de-fcf32e80a450
` as our first choice and `gnulinux-5.19.0-38-generic-advanced-80fb29ca-9952-461c-a7de-fcf32e80a450
` as our second. So edit `/etc/default/grub` and set
```
GRUB_DEFAULT='gnulinux-5.15.0-69-lowlatency-advanced-80fb29ca-9952-461c-a7de-fcf32e80a450>gnulinux-5.19.0-38-generic-advanced-80fb29ca-9952-461c-a7de-fcf32e80a450'
```