Grub repair
Grub repair in Ubuntu
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install boot-repair
https://itsfoss.com/fix-ubuntu-freezing/
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install boot-repair
https://itsfoss.com/fix-ubuntu-freezing/