diff --git a/setup/bootstrap.sh b/setup/bootstrap.sh
index 499722d0..c3729112 100644
--- a/setup/bootstrap.sh
+++ b/setup/bootstrap.sh
@@ -7,23 +7,13 @@
 #########################################################
 
 if [ -z "$TAG" ]; then
-	# If a version to install isn't explicitly given as an environment
-	# variable, then install the latest version. But the latest version
-	# depends on the operating system. Existing Ubuntu 14.04 users need
-	# to be able to upgrade to the latest version supporting Ubuntu 14.04,
-	# in part because an upgrade is required before jumping to Ubuntu 18.04.
-	# New users on Ubuntu 18.04 need to get the latest version number too.
-	#
-	# Also, the system status checks read this script for TAG = (without the
-	# space, but if we put it in a comment it would confuse the status checks!)
-	# to get the latest version, so the first such line must be the one that we
-	# want to display in status checks.
-	if [ "`lsb_release -d | sed 's/.*:\s*//' `" == "Debian GNU/Linux 10 (buster)" ]; then
+	# Make s
+	OS=`lsb_release -d | sed 's/.*:\s*//'`
+	if [ "$OS" == "Debian GNU/Linux 10 (buster)" -o "$OS" == "Ubuntu 20.04 LTS"]; then
 		# This machine is running Ubuntu 18.04.
 		TAG=v0.44.POWER.5
-
 	else
-		echo "This script must be run on a system running Debian 10."
+		echo "This script must be run on a system running Debian 10 OR Ubuntu 20.04 LTS."
 		exit 1
 	fi
 fi
diff --git a/setup/functions.sh b/setup/functions.sh
index cdf89bed..509d3dc0 100644
--- a/setup/functions.sh
+++ b/setup/functions.sh
@@ -215,4 +215,11 @@ function git_clone {
 	rm -rf $TMPPATH
 }
 
-export PHP_VERSION="7.3" # Expected php version
+OS=`lsb_release -d | sed 's/.*:\s*//' `
+
+# Expected php version
+if [ "$OS" == "Debian GNU/Linux 10 (buster)" ]; then
+	export PHP_VERSION="7.3"
+elif [ "$OS" == "Ubuntu 20.04 LTS" ]; then
+	export PHP_VERSION="7.4"
+fi
diff --git a/setup/preflight.sh b/setup/preflight.sh
index 8e3fbdd7..51952693 100644
--- a/setup/preflight.sh
+++ b/setup/preflight.sh
@@ -8,8 +8,9 @@ if [[ $EUID -ne 0 ]]; then
 fi
 
 # Check that we are running on Debian GNU/Linux
-if [ "`lsb_release -d | sed 's/.*:\s*//' `" != "Debian GNU/Linux 10 (buster)" ]; then
-	echo "Mail-in-a-Box only supports being installed on Debian 10, sorry. You are running:"
+OS=`lsb_release -d | sed 's/.*:\s*//' `
+if [ "$OS" != "Debian GNU/Linux 10 (buster)" -a "$OS" != "Ubuntu 20.04 LTS" ]; then
+	echo "Mail-in-a-Box only supports being installed on Debian 10 or Ubuntu 20.04 LTS, sorry. You are running:"
 	echo
 	lsb_release -d | sed 's/.*:\s*//'
 	echo