fvp dockerfiles ubuntu version update

Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>
Change-Id: Ie6ae563849fff2fbc2fc72be4d92278b479bed84
diff --git a/create-model-dockerfile.sh b/create-model-dockerfile.sh
index 5c582b9..ce7aa26 100755
--- a/create-model-dockerfile.sh
+++ b/create-model-dockerfile.sh
@@ -13,7 +13,7 @@
 
 # globals
 OS="${OS:-ubuntu}"
-OS_VER="${OS_VERSION:-bionic}"
+OS_VER="${OS_VERSION:-focal}"
 MODEL_DIR="${MODEL_DIR:-/opt/model}"
 
 function usage() {
diff --git a/create_fvp_dockerfile.sh b/create_fvp_dockerfile.sh
index 55fbf0f..35975f9 100755
--- a/create_fvp_dockerfile.sh
+++ b/create_fvp_dockerfile.sh
@@ -6,7 +6,7 @@
 #
 
 OS="${OS:-ubuntu}"
-OS_VER="${OS_VERSION:-bionic}"
+OS_VER="${OS_VERSION:-focal}"
 MODEL_DIR="${MODEL_DIR:-/opt/model}"
 
 function model() {