@@ -599,8 +599,12 @@ VIRT_DRIVER=${VIRT_DRIVER:-$DEFAULT_VIRT_DRIVER}

 case "$VIRT_DRIVER" in

     ironic|libvirt)

         LIBVIRT_TYPE=${LIBVIRT_TYPE:-kvm}

-        if [[ "$os_VENDOR" =~ (Debian) ]]; then

-            LIBVIRT_GROUP=libvirt

+        if [[ "$os_VENDOR" =~ (Debian|Ubuntu) ]]; then

+            # The groups change with newer libvirt. Older Ubuntu used

+            # 'libvirtd', but now uses libvirt like Debian. Do a quick check

+            # to see if libvirtd group already exists to handle grenade's case.

+            LIBVIRT_GROUP=$(cut -d ':' -f 1 /etc/group | grep 'libvirtd$' || true)

+            LIBVIRT_GROUP=${LIBVIRT_GROUP:-libvirt}

         else

             LIBVIRT_GROUP=libvirtd

         fi

@@ -67,6 +67,33 @@ else

     echo_summary "WARNING: unable to reserve keystone ports"

 fi

+# Ubuntu Cloud Archive

+#---------------------

+# 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

+    # This pulls in apt-add-repository

+    install_package "software-properties-common"

+    # Use UCA for newer libvirt. Should give us libvirt 2.5.0.

+    if [[ -f /etc/ci/mirror_info.sh ]] ; then

+        # If we are on a nodepool provided host and it has told us about where

+        # we can find local mirrors then use that mirror.

+        source /etc/ci/mirror_info.sh

+

+        sudo apt-add-repository -y "deb $NODEPOOL_UCA_MIRROR xenial-updates/ocata main"

+

+        # Disable use of libvirt wheel here as presence of mirror implies

+        # presence of cached wheel build against older libvirt binary.

+        # TODO(clarkb) figure out how to use wheel again.

+        sudo bash -c 'echo "no-binary = libvirt-python" >> /etc/pip.conf'

+    else

+        # Otherwise use upstream UCA

+        sudo add-apt-repository -y cloud-archive:ocata

+    fi

+    sudo apt-get update

+fi

+

 # Python Packages

 # ---------------