Reinstall Kernel in Ubuntu/Debian

To reinstall Kernel in Ubunru, you need to find the version of kernal installed, for this run

dpkg -l | grep linux-image

Or you can use command, find the kernel version you need to install

apt-cache search linux-image

Once you have the name of linux-image package you need to install, you can run

apt-get install --reinstall PKG_NAME_HERE

Example

See apt, Ubuntu, Debian