Ubuntu 22.04 Set default boot kernel for grub

To set default boot kernel for grub in Ubuntu 22.04 use:

Open /boot/grub/grub.cfg to check which menuentry should be booted by default
```
grep menuentry /boot/grub/grub.cfg
```
For selecting third option from "Advanced options for Ubuntu" submenu, edit /etc/default/grub file and set:
```
GRUB_DEFAULT="1>2"
```
Here first 1 selects second option - "Advanced options for Ubuntu" from top grub menu. Then 2 selects third option from the subsequent sub-menu
Update grub
```
sudo update-grub
```
Reboot and test

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