diff --git a/ubuntu/scripts/curtin-hooks b/ubuntu/scripts/curtin-hooks
index 48dab47..29e24da 100644
--- a/ubuntu/scripts/curtin-hooks
+++ b/ubuntu/scripts/curtin-hooks
@@ -20,66 +20,71 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import os
-import shutil
 import platform
+import shutil
+import sys
 
 from curtin import distro, util
+from curtin.commands import apt_config, curthooks
 from curtin.config import load_command_config
 from curtin.log import LOG
 from curtin.paths import target_path
-from curtin.util import load_command_environment, ChrootableTarget
-from curtin.commands import curthooks, apt_config
+from curtin.util import ChrootableTarget, load_command_environment
+
 
 def run_hook_in_target(target, hook):
     """Look for "hook" in "target" and run in a chroot"""
-    target_hook = target_path(target, '/curtin/' + hook)
+    target_hook = target_path(target, "/curtin/" + hook)
     if os.path.isfile(target_hook):
         LOG.debug("running %s" % target_hook)
         with ChrootableTarget(target=target) as in_chroot:
-            in_chroot.subp(['/curtin/' + hook])
+            in_chroot.subp(["/curtin/" + hook])
         return True
     return False
 
+
 def curthook(cfg, target, state):
     """Configure network and bootloader"""
-    LOG.info('Running curtin builtin curthooks')
-    state_etcd = os.path.split(state['fstab'])[0]
+    LOG.info("Running curtin builtin curthooks")
+    state_etcd = os.path.split(state["fstab"])[0]
     machine = platform.machine()
 
     distro_info = distro.get_distroinfo(target=target)
     if not distro_info:
-        raise RuntimeError('Failed to determine target distro')
+        raise RuntimeError("Failed to determine target distro")
     osfamily = distro_info.family
-    LOG.info('Configuring target system for distro: %s osfamily: %s',
-             distro_info.variant, osfamily)
-    
-    sources = cfg.get('sources', {})
+    LOG.info(
+        "Configuring target system for distro: %s osfamily: %s",
+        distro_info.variant,
+        osfamily,
+    )
+
+    sources = cfg.get("sources", {})
     dd_image = len(util.get_dd_images(sources)) > 0
 
     curthooks.disable_overlayroot(cfg, target)
     curthooks.disable_update_initramfs(cfg, target, machine)
     curthooks.install_missing_packages(cfg, target, osfamily=osfamily)
-    
+
     if not dd_image:
         curthooks.configure_iscsi(cfg, state_etcd, target, osfamily=osfamily)
         curthooks.configure_mdadm(cfg, state_etcd, target, osfamily=osfamily)
-        curthooks.copy_fstab(state.get('fstab'), target)
-        curthooks.add_swap(cfg, target, state.get('fstab'))
+        curthooks.copy_fstab(state.get("fstab"), target)
+        curthooks.add_swap(cfg, target, state.get("fstab"))
 
-    run_hook_in_target(target, 'install-custom-packages')
+    run_hook_in_target(target, "install-custom-packages")
 
     if not dd_image:
         curthooks.setup_kernel_img_conf(target)
 
-        crypttab_location = os.path.join(os.path.split(state['fstab'])[0],
-                                        "crypttab")
+        crypttab_location = os.path.join(os.path.split(state["fstab"])[0], "crypttab")
         if os.path.exists(crypttab_location):
             curthooks.copy_crypttab(crypttab_location, target)
 
-        udev_rules_d = os.path.join(state['scratch'], "rules.d")
+        udev_rules_d = os.path.join(state["scratch"], "rules.d")
         if os.path.isdir(udev_rules_d):
             curthooks.copy_dname_rules(udev_rules_d, target)
-    
+
     apt_config.apply_debconf_selections(cfg, target)
 
     curthooks.apply_networking(target, state)
@@ -88,8 +93,8 @@ def curthook(cfg, target, state):
     # re-enable update_initramfs
     curthooks.enable_update_initramfs(cfg, target, machine)
     curthooks.update_initramfs(target, all_kernels=True)
-    
-    run_hook_in_target(target, 'setup-bootloader')
+
+    run_hook_in_target(target, "setup-bootloader")
 
 
 def cleanup():
@@ -101,7 +106,7 @@ def cleanup():
 def main():
     state = load_command_environment()
     config = load_command_config(None, state)
-    target = state['target']
+    target = state["target"]
 
     curthook(config, target, state)
     cleanup()
diff --git a/ubuntu/scripts/networking.sh b/ubuntu/scripts/networking.sh
index c1cc45d..5536e14 100644
--- a/ubuntu/scripts/networking.sh
+++ b/ubuntu/scripts/networking.sh
@@ -22,7 +22,7 @@ export DEBIAN_FRONTEND=noninteractive
 
 apt-get install -qy netplan.io cloud-init
 
-cat > /etc/sysctl.d/99-cloudimg-ipv6.conf <<EOF
+cat >/etc/sysctl.d/99-cloudimg-ipv6.conf <<EOF
 net.ipv6.conf.all.use_tempaddr = 0
 net.ipv6.conf.default.use_tempaddr = 0
 EOF