Ubuntu - GPU - Mesa - Install Mesa Utilities - Install the latest bleeding-edge version of the Mesa driver

To have the very latest Mesa drivers as they are being developed.

WARNING: This uses a PPA.

This PPA provides open source graphics drivers packages for Radeon, Intel and Nvidia hardware.
All driver packages are automatically built twice a day, when there is an upstream change.

Install the Oibaf Mesa PPA driver

sudo add-apt-repository ppa:oibaf/graphics-drivers
sudo apt update
sudo apt upgrade

NOTE: This will install the latest Mesa drivers.

Edit /etc/apt/preferences.d/oibaf-pin-2000, and populate as:

Package: *
Pin: release o=LP-ppa-oibaf-graphics-drivers
Pin-Priority: 2000

NOTE: This gives the PPA a higher priority, over the standard.

You can remove the PPA and the latest Mesa driver using the ppa-purge tool.

Install it first:

sudo apt-get install ppa-purge

Now use it to disable the PPA you had added and revert the Mesa package to the version provided by Ubuntu officially.

sudo ppa-purge ppa:oibaf/graphics-drivers

NOTE: ppa-purge is sometimes deprecated.

Instead, use sudo add-apt-repository with the -r option added at the end of the command.

sudo add-apt-repository ppa:oibaf/graphics-drivers -r