Ubuntu list all installed kernels and current kernel running

Debian / Ubuntu Linux user can use the following command to check the kernel information.

To List current kernel installed in system use the command uname

Command

   $ uname -r 

where -r print kernel-release

Output

   4.15.0-54-generic
 

or use

Command

   uname -mrs
 

Output

   Linux 4.15.0-54-generic x86_64
 

Where,
    -m --- print machine hardware name
    -r --- print kernel-release
    -s --- print kernel-name

To List all installed kernel in system use the command dpkg

Command

   $ dpkg --list | grep linux-image
 

Output

 ii  linux-image-4.15.0-45-generic  4.15.0-45.48~16.04.1   amd64   Signed kernel image generic
 ii  linux-image-4.15.0-54-generic  4.15.0-54.58~16.04.1   amd64   Signed kernel image generic
 ii  linux-image-generic-hwe-16.04  4.15.0.54.75           amd64   Generic Linux kernel image