Improvements to try resolve the issues with login checksums.

packaging/pristontale-eu

@@ -31,11 +31,10 @@ then
 	exit 1
 fi
 
-if [ -n "${PYTHONPATH:-}" ]
-then
-	export PYTHONPATH="${release_root}:${PYTHONPATH}"
-else
-	export PYTHONPATH="${release_root}"
-fi
+# Never let an unpacked older installer in the caller's current directory
+# shadow the selected installed release. Children started by the dashboard
+# inherit the same safe-path policy and exact package root.
+export PYTHONSAFEPATH=1
+export PYTHONPATH="${release_root}"
 
-exec "$python_bin" -m ptlinux "$@"
+exec "$python_bin" -P -m ptlinux "$@"