Downgrade Ubuntu kernel & modify the default boot kernel [Absolutely useful]

Kernel downgrade

https://blog.csdn.net/samsarange/article/details/104277153

https://blog.csdn.net/u013431916/article/details/82530523

Modify the default kernel startup

1] View the kernel list

sudo dpkg --get-selections |grep linux-image

2】sudo gedit /etc/default/grub

Put

GRUB_DEFAULT=0

change into

GRUB_DEFAULT="Ubuntu Advanced Options>Ubuntu,Linux 4.4.0-75-generic"

PS: In fact, it can be "1>3" similar to this numbering form, or you can directly specify the version name as above.

3】sudo update-grub

Reference:
https://blog.csdn.net/u011304615/article/details/70919711

https://blog.csdn.net/bby1987/article/details/104264285

https://blog.csdn.net/Therock_of_lty/article/details/105416680

https://www.cnblogs.com/boyzgw/p/6227430.html