Pin version of LXD to latest LTS

Change-Id: I31f5540e0d8991006e8b3767a94fe4126945cafb
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/installers/charmed_install.sh b/installers/charmed_install.sh
index 06361c8..f1dd29a 100755
--- a/installers/charmed_install.sh
+++ b/installers/charmed_install.sh
@@ -15,7 +15,7 @@
 
 # set -eux
 
-LXD_VERSION=4.17
+LXD_VERSION=4.0
 JUJU_VERSION=2.9
 JUJU_AGENT_VERSION=2.9.9
 K8S_CLOUD_NAME="k8s-cloud"
diff --git a/installers/full_install_osm.sh b/installers/full_install_osm.sh
index 517a38e..e61ad72 100755
--- a/installers/full_install_osm.sh
+++ b/installers/full_install_osm.sh
@@ -1521,7 +1521,7 @@
     DOCKER_REGISTRY_URL=$(echo "$DOCKER_REGISTRY_URL" | awk '{split($1,a,"@"); print a[2]}')
 }
 
-LXD_VERSION=4.17
+LXD_VERSION=4.0
 JUJU_VERSION=2.9
 JUJU_AGENT_VERSION=2.9.9
 UNINSTALL=""