diff --git a/bin/subiquity-service b/bin/subiquity-service
index 6f487e57..b6b2240e 100755
--- a/bin/subiquity-service
+++ b/bin/subiquity-service
@@ -1,5 +1,6 @@
 #!/bin/sh
 /bin/dmesg -n 1
+export PATH=$SNAP/bin:$SNAP/usr/bin:$PATH
 $SNAP/usr/bin/subiquity-loadkeys
 setfont $SNAP/subiquity.psf
 /sbin/agetty -n --noclear -l $SNAP/usr/bin/python3 -o $SNAP/usr/bin/subiquity tty1 $TERM
diff --git a/snapcraft.yaml b/snapcraft.yaml
index 242e3d37..1540ebd5 100644
--- a/snapcraft.yaml
+++ b/snapcraft.yaml
@@ -19,6 +19,16 @@ apps:
     restart-condition: always
 
 parts:
+  curtin:
+    plugin: python
+    source-type: git
+    source: git://git.launchpad.net/curtin
+    source-branch: ubuntu/devel
+    requirements: requirements.txt
+    organize:
+      'lib/python*/site-packages/usr/lib/curtin': 'usr/lib/'
+    stage: [ "*", "-lib/python*/site-packages/_yaml.*.so" ]
+    stage-packages: [libc6]
   subiquity:
     plugin: python
     build-packages:
@@ -53,11 +63,11 @@ parts:
     plugin: dump
     build-packages:
       - user-setup
-    prepare: |
+    override-build: |
       echo "get passwd/user-default-groups" | \
         debconf-communicate user-setup | \
-        cut -d ' ' -f 2- > users-and-groups
-      cp /usr/lib/user-setup/reserved-usernames .
+        cut -d ' ' -f 2- > $SNAPCRAFT_PART_INSTALL/users-and-groups
+      cp /usr/lib/user-setup/reserved-usernames $SNAPCRAFT_PART_INSTALL/
     stage-packages: [libc6]
     stage:
       - users-and-groups
@@ -69,8 +79,8 @@ parts:
       - locales
       - xkb-data-i18n
     stage-packages: [libc6]
-    prepare: |
-      /usr/share/console-setup/kbdnames-maker /usr/share/console-setup/KeyboardNames.pl > kbdnames.txt
+    override-build: |
+      /usr/share/console-setup/kbdnames-maker /usr/share/console-setup/KeyboardNames.pl > $SNAPCRAFT_PART_INSTALL/kbdnames.txt
     stage:
       - kbdnames.txt
   font:
diff --git a/subiquity/cmd/tui.py b/subiquity/cmd/tui.py
index 9c86a08d..b54a24eb 100755
--- a/subiquity/cmd/tui.py
+++ b/subiquity/cmd/tui.py
@@ -41,10 +41,6 @@ checks:
         directory:
             - /proc
             - /sys
-    exec:
-        file:
-            - /sbin/hdparm
-            - /usr/bin/curtin
 '''
 
 
diff --git a/subiquity/controllers/installprogress.py b/subiquity/controllers/installprogress.py
index e79c0c5b..585512c1 100644
--- a/subiquity/controllers/installprogress.py
+++ b/subiquity/controllers/installprogress.py
@@ -17,6 +17,7 @@ import datetime
 import logging
 import os
 import subprocess
+import sys
 
 import urwid
 import yaml
@@ -86,10 +87,10 @@ class InstallProgressController(BaseController):
         self.progress_view.show_complete(True)
         self.default()
 
-    def _bg_run_command_logged(self, cmd, env):
+    def _bg_run_command_logged(self, cmd):
         cmd = ['systemd-cat', '--level-prefix=false',
                '--identifier=' + self._log_syslog_identifier] + cmd
-        return utils.run_command(cmd, env=env)
+        return utils.run_command(cmd)
 
     def _journal_event(self, event):
         if event['SYSLOG_IDENTIFIER'] == self._event_syslog_identifier:
@@ -154,7 +155,7 @@ class InstallProgressController(BaseController):
             log.debug("Installprogress: this is the *REAL* thing")
             config_location = os.path.join('/var/log/installer',
                                            config_file_name)
-            curtin_cmd = ['curtin', '--showtrace', '-c',
+            curtin_cmd = [sys.executable, '-m', 'curtin', '--showtrace', '-c',
                           config_location, 'install']
 
         ident = self._event_syslog_identifier
@@ -183,11 +184,8 @@ class InstallProgressController(BaseController):
         curtin_cmd = self._get_curtin_command()
 
         log.debug('Curtin install cmd: {}'.format(curtin_cmd))
-        env = os.environ.copy()
-        if 'SNAP' in env:
-            del env['SNAP']
         self.run_in_bg(
-            lambda: self._bg_run_command_logged(curtin_cmd, env),
+            lambda: self._bg_run_command_logged(curtin_cmd),
             self.curtin_install_completed)
 
     def curtin_install_completed(self, fut):