diff --git a/.github/appveyor.yml b/.github/appveyor.yml
index 18aa55b3c..39dae8813 100644
--- a/.github/appveyor.yml
+++ b/.github/appveyor.yml
@@ -58,7 +58,7 @@ for:
      - wsl whoami
      - wsl cat /etc/os-release
      - wsl sudo DEBIAN_FRONTEND=noninteractive apt-get update
-     - wsl sudo DEBIAN_FRONTEND=noninteractive apt-get install -y python3-venv python3-pip
+     - wsl sudo DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y python3-venv python3-pip
      - wsl python3 -m venv .
      - wsl bin/pip install -U pip tox
     test_script:
diff --git a/gunicorn/packaging_support.py b/gunicorn/packaging_support.py
index c84099cd5..554fc6b47 100644
--- a/gunicorn/packaging_support.py
+++ b/gunicorn/packaging_support.py
@@ -26,8 +26,9 @@ def _minimum_version_of_installed(package_name, spew=True):
                 all_spec.append(requirement.specifier)
         # simplication: this will fail on > operator (mentioned is not acceptable)
         all_version = [spec.version for spec_list in all_spec for spec in spec_list]
+        # Python 3.7 cleanup: sum(iterable, /, start=0)
         acceptable_mentioned = sum(
-            (list(spec_list.filter(all_version)) for spec_list in all_spec), start=[]
+            (list(spec_list.filter(all_version)) for spec_list in all_spec), []
         )
         lowest_mentioned = min(acceptable_mentioned, default=None)
         if lowest_mentioned:
diff --git a/tests/test_e2e.py b/tests/test_e2e.py
index 4c8ee5966..af737801f 100644
--- a/tests/test_e2e.py
+++ b/tests/test_e2e.py
@@ -63,10 +63,14 @@ def bad_method():
 import signal
 import os
 
-logging.basicConfig(force=True)
-logger = logging.getLogger(__name__)
+if sys.version_info >= (3, 8):
+    logging.basicConfig(force=True)
+    logger = logging.getLogger(__name__)
+    logger.info("logger has been reset")
+else:
+    logger = logging.getLogger(__name__)
+    logging.basicConfig()
 
-logger.warning("logger has been reset before import error happens")
 # os.kill(os.getppid(), signal.SIGTERM)
 # sys.exit(3)
 import syntax_error
@@ -119,7 +123,7 @@ def run(self):
                 sys.executable,
                 "-m",
                 "gunicorn",
-                #"--config=%s" % os.devnull,
+                # "--config=%s" % os.devnull,
                 "--config=%s" % self.conf_path,
                 "--log-level=debug",
                 "--worker-class=sync",
@@ -215,7 +219,9 @@ def test_process_request_after_fixing_syntax_error():
             assert "load_wsgi" not in body.lower()
 
             access_log = server._read_stdio(
-                key=OUT, wait_for_keyword='GET / HTTP/1.1" 500 ', timeout_sec=5,
+                key=OUT,
+                wait_for_keyword='GET / HTTP/1.1" 500 ',
+                timeout_sec=5,
             )
             # trigger reloader
             server.write_ok()
@@ -235,7 +241,9 @@ def test_process_request_after_fixing_syntax_error():
             assert "response body from app" == body
 
             debug_log = server._read_stdio(
-                key=ERR, wait_for_keyword="stderr from app", timeout_sec=5,
+                key=ERR,
+                wait_for_keyword="stderr from app",
+                timeout_sec=5,
             )
 
             shutdown_log = server._graceful_quit()
diff --git a/tests/test_e2e_debug.py b/tests/test_e2e_debug.py
index 9c22cadc9..13eadab2d 100644
--- a/tests/test_e2e_debug.py
+++ b/tests/test_e2e_debug.py
@@ -34,12 +34,15 @@
 import sys
 import logging
 
-logging.basicConfig(force=True)
-logger = logging.getLogger(__name__)
+if sys.version_info >= (3, 8):
+    logging.basicConfig(force=True)
+    logger = logging.getLogger(__name__)
+    logger.info("logger has been reset")
+else:
+    logging.basicConfig()
+    logger = logging.getLogger(__name__)
 
 def app(environ_, start_response):
-    # print("stdout from app", file=sys.stdout)
-    logger.warning("logger has been reset")
     print("stderr from app", file=sys.stderr)
     # needed for Python <= 3.8
     sys.stderr.flush()
@@ -101,9 +104,9 @@ def run(self):
                 "--log-level=debug",
                 "--workers=3",
                 "--worker-class=sync",
-                #"--enable-stdio-inheritance",
-                #"--access-logfile=-",
-                #"--disable-redirect-access-to-syslog",
+                # "--enable-stdio-inheritance",
+                # "--access-logfile=-",
+                # "--disable-redirect-access-to-syslog",
                 "--graceful-timeout=%d" % GRACEFUL_TIMEOUT,
                 "--on-fatal=world-readable",
                 # "--reload",
@@ -187,7 +190,9 @@ def test_process_shutdown_cleanly_after_inserting_syntax_error():
             assert "response body from app" == body
 
             debug_log = server._read_stdio(
-                key=ERR, wait_for_keyword="stderr from app", timeout_sec=5,
+                key=ERR,
+                wait_for_keyword="stderr from app",
+                timeout_sec=5,
             )
 
             # trigger reloader