How do I revert from 4.15.0-72 generic back to 4.15.0.70 generic?

Question

Running Ubuntu 18.04.3 --------------------- I think the 4.15.0-72 generic kernel is corrupt or perhaps just incapable of working properly on my older laptop - it will freeze on shutdown every time when using the default 4.15.0-72 generic, but will shutdown fine when I interrupt boot-up and select 4.15.0-70 generic to boot instead... or is there something else going on?

Answer 1

backup old version

sudo cp /etc/default/grub /etc/default/grub.backup

edit grub config file

 sudo nano /etc/default/grub

Change

#GRUB_DEFAULT=0
GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 4.15.0-70-generic"

save, then

sudo update-grub
sudo reboot