docs: recommend Ubuntu 20.04 instead of Bionic
Bionic support was dropped in I39e38e4a6c2e52dd3822c9fdea354258359a9f53.
Change-Id: I765aac352590fd2f74d3fd90676d6d098548e6b8
diff --git a/doc/source/index.rst b/doc/source/index.rst
index 8b8acde..9f477ab 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -40,7 +40,7 @@
attempts to support the two latest LTS releases of Ubuntu, the
latest/current Fedora version, CentOS/RHEL 8 and OpenSUSE.
-If you do not have a preference, Ubuntu 18.04 (Bionic Beaver) is the
+If you do not have a preference, Ubuntu 20.04 (Focal Fossa) is the
most tested, and will probably go the smoothest.
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