diff --git a/snapcraft.yaml b/snapcraft.yaml
index 928098a2f..c21fdea56 100644
--- a/snapcraft.yaml
+++ b/snapcraft.yaml
@@ -64,7 +64,7 @@ parts:
     plugin: python
     source-type: git
     source: https://git.launchpad.net/curtin
-    source-commit: 47c222681c81110a185497a64749f23596e29b16
+    source-commit: 1fc717df52ec15f616d26fff3c10bff181599b30
     build-packages:
       - shared-mime-info
       - zlib1g-dev
diff --git a/subiquity/server/apt.py b/subiquity/server/apt.py
index 469984013..e4b27243c 100644
--- a/subiquity/server/apt.py
+++ b/subiquity/server/apt.py
@@ -18,6 +18,7 @@
 import logging
 import os
 import shutil
+import subprocess
 import tempfile
 from typing import List, Optional, Union
 
@@ -34,6 +35,10 @@
 log = logging.getLogger('subiquity.server.apt')
 
 
+class OverlayCleanupError(Exception):
+    """ Exception to raise when an overlay could not be cleaned up. """
+
+
 class _MountBase:
 
     def p(self, *args: str) -> str:
@@ -245,7 +250,10 @@ async def overlay(self):
             # Mountpoint object and (thanks to attr.s) make sure that it
             # compares equal to the one we discarded earlier.
             # But really, there should be better ways to handle this.
-            await self.unmount(Mountpoint(mountpoint=overlay.mountpoint))
+            try:
+                await self.unmount(Mountpoint(mountpoint=overlay.mountpoint))
+            except subprocess.CalledProcessError as exc:
+                raise OverlayCleanupError from exc
 
     async def cleanup(self):
         for m in reversed(self._mounts):
diff --git a/subiquity/server/controllers/drivers.py b/subiquity/server/controllers/drivers.py
index ade96456c..77cbb2aee 100644
--- a/subiquity/server/controllers/drivers.py
+++ b/subiquity/server/controllers/drivers.py
@@ -21,6 +21,7 @@
 
 from subiquity.common.apidef import API
 from subiquity.common.types import DriversPayload, DriversResponse
+from subiquity.server.apt import OverlayCleanupError
 from subiquity.server.controller import SubiquityController
 from subiquity.server.types import InstallerChannels
 from subiquity.server.ubuntu_drivers import (
@@ -83,16 +84,19 @@ async def _list_drivers(self, context):
             await self.configured()
             return
         apt = self.app.controllers.Mirror.apt_configurer
-        async with apt.overlay() as d:
-            try:
-                # Make sure ubuntu-drivers is available.
-                await self.ubuntu_drivers.ensure_cmd_exists(d.mountpoint)
-            except CommandNotFoundError:
-                self.drivers = []
-            else:
-                self.drivers = await self.ubuntu_drivers.list_drivers(
-                    root_dir=d.mountpoint,
-                    context=context)
+        try:
+            async with apt.overlay() as d:
+                try:
+                    # Make sure ubuntu-drivers is available.
+                    await self.ubuntu_drivers.ensure_cmd_exists(d.mountpoint)
+                except CommandNotFoundError:
+                    self.drivers = []
+                else:
+                    self.drivers = await self.ubuntu_drivers.list_drivers(
+                        root_dir=d.mountpoint,
+                        context=context)
+        except OverlayCleanupError:
+            log.exception("Failed to cleanup overlay. Continuing anyway.")
         log.debug("Available drivers to install: %s", self.drivers)
         if not self.drivers:
             await self.configured()