diff --git a/stackrc b/stackrc
index 1300f45cda..f7a0c876f2 100644
--- a/stackrc
+++ b/stackrc
@@ -665,6 +665,8 @@ case "$VIRT_DRIVER" in
         ;;
 esac
 
+# By default, devstack will use Ubuntu Cloud Archive.
+ENABLE_UBUNTU_CLOUD_ARCHIVE=$(trueorfalse True ENABLE_UBUNTU_CLOUD_ARCHIVE)
 
 # Images
 # ------
diff --git a/tools/fixup_stuff.sh b/tools/fixup_stuff.sh
index d07d2675c6..0b78bdeb00 100755
--- a/tools/fixup_stuff.sh
+++ b/tools/fixup_stuff.sh
@@ -72,7 +72,10 @@ fi
 # We've found that Libvirt on Xenial is flaky and crashes enough to be
 # a regular top e-r bug. Opt into Ubuntu Cloud Archive if on Xenial to
 # get newer Libvirt.
-if [[ "$DISTRO" = "xenial" ]]; then
+# Make it possible to switch this based on an environment variable as
+# libvirt 2.5.0 doesn't handle nested virtualization quite well and this
+# is required for the trove development environment.
+if [[ "${ENABLE_UBUNTU_CLOUD_ARCHIVE}" == "True" && "$DISTRO" = "xenial" ]]; then
     # This pulls in apt-add-repository
     install_package "software-properties-common"
     # Use UCA for newer libvirt. Should give us libvirt 2.5.0.