test: update Ubuntu CI instructions

diff --git a/test/README.testsuite b/test/README.testsuite
index 14386ff9e752aaf61df01464f437ce7f10ea23c0..9174e1695f9527d6ee819d6ab8b3978fe1dc67bb 100644 (file)
--- a/test/README.testsuite
+++ b/test/README.testsuite
@@ -209,6 +209,7 @@ Prepare a testbed image for autopkgtest (tweak the release as necessary):
 And finally run the autopkgtest itself:
 
 # autopkgtest -o logs *.deb systemd/ \
+              --env=TEST_UPSTREAM=1 \
               --timeout-factor=3 \
               --test-name=boot-and-services \
               --shell-fail \