checkdeps.py

@@ -137,6 +137,8 @@ if prereqs:
 OPSYS = detectOS()
 CMD = PACKAGE_MANAGER[OPSYS] if OPSYS in PACKAGE_MANAGER else 'UNKNOWN_INSTALLER'
 for lhs, rhs in EXTRAS_REQUIRE.items():
+    if OPSYS is None:
+        break
     if rhs and any([
         EXTRAS_REQUIRE_DEPS[x][OPSYS]
         for x in rhs

src/depends.py

@@ -29,6 +29,7 @@ logger.addHandler(handler)
 logger.setLevel(logging.ERROR)
 
 OS_RELEASE = {
+    "Debian GNU/Linux".lower(): "Debian",
     "fedora": "Fedora",
     "opensuse": "openSUSE",
     "ubuntu": "Ubuntu",