How to delete a specific kernel?

Question

I have installed a wrong version of the kernel. I want delete it because it is also visible from the grub advanced option.

Answer 1

Let's explain it by using an example ... boot with the kernel you want to keep, in this case kernel 4.2.0-35. To check which kernel versions currently are installed, open a terminal and execute :

dpkg --get-selections | grep linux  

The output in this example shows that kernels 4.2.0-34 and 4.2.0-35 are currently installed.

linux-firmware                          install  
linux-generic                           install  
linux-headers-4.2.0-34                  install  
linux-headers-4.2.0-35                  install
linux-headers-4.2.0-34-generic          install
linux-headers-4.2.0-35-generic          install  
linux-headers-generic                   install  
linux-image-4.2.0-34-generic            install  
linux-image-4.2.0-35-generic            install
linux-image-extra-4.2.0-34-generic      install
linux-image-extra-4.2.0-35-generic      install  
linux-image-generic                     install  
linux-libc-dev:amd64                    install  
linux-signed-generic                    install  
linux-signed-image-4.2.0-34-generic     install  
linux-signed-image-4.2.0-35-generic     install
linux-signed-image-generic              install  

Assuming that the older kernel 4.2.0-34 shall be removed - execute the following command :

sudo apt-get purge linux-headers-4.2.0-34 linux-headers-4.2.0-34-generic linux-image-4.2.0-34-generic linux-image-extra-4.2.0-34-generic linux-signed-image-4.2.0-34-generic

Done! :-)