Upgrade Ubuntu 20.04 Linux Kernel

Verify Installed Kernel Version

Type the following command in command line to view currently installed Kernel version:

sudo uname -r

Should output output similar to below:

5.4.0-80-generic

Download latest Kernel Version

Navigate to the kernel-ppa website and then click on the latest Kernel version (at the time of this writing v5.15, adjust as necessary) (Figure 1).

Figure 1

Next click on your platform version (most likely amd64) (Figure 2).

Figure 2

Using wget download the following files (adjust file names to your version and date) (Figure 3):

wget linux-headers-<VERSION-NO>_<VERSION-NO.<DATE>_all.deb
wget linux-image-unsigned-<VERSION-NO>-generic_<VERSION-NO>.<DATE>_amd64.deb
wget linux-modules-<VERSION-NO>-generic_<VERSION-NO>.<DATE>_amd64.deb

Figure 3

Install latest Kernel version

From the directory where you downloaded all the Kernel .deb files from above, run the following command:

sudo dpkg -i *.deb

Once installation is finished, reboot your computer and check that the Kernel has been upgraded by running the following command again:

sudo uname -r