diff --git a/debian-pkg/debian/tinypilot.postinst b/debian-pkg/debian/tinypilot.postinst
index 4c0161065..e6964f990 100755
--- a/debian-pkg/debian/tinypilot.postinst
+++ b/debian-pkg/debian/tinypilot.postinst
@@ -21,6 +21,9 @@ getent group "${TINYPILOT_GROUP}" > /dev/null || \
 # adduser is idempotent, so we don't need to check existence first.
 adduser \
   --system \
+  `# We have to specify a shell to override the default /usr/sbin/nologin, ` \
+  `# which prevents us from executing commands through "sudo su".` \
+  --shell /bin/bash \
   --ingroup "${TINYPILOT_GROUP}" \
   --home "${TINYPILOT_HOME_DIR}" \
   "${TINYPILOT_USER}"