Ubuntu version references were a mixture of 14.04 (in descriptions) and 20.04 (in example code). Updated description references to 20.04 to match example code.
Signed-off-by: Mike Dalton <mikedalton@github.com>
(cherry picked from commit 6ad2ceba3c)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>