How to Remove Old Kernals from Debian Ubuntu

To check the available installed kernels in your debian machine run the following command:
dpkg -l | grep linux-image
To check the currently used kernel version you can run:
uname -r
To remove the all the unused kernels you can simply run:
sudo apt-get autoremove --purge
To remove a specific kernel version, you can run:
sudo apt-get purge linux-image-5.8.0-43-generic