The Ubuntu version seems to be ttc

jkseppan · jkseppan · commit a71185cbcf70 · 2021-08-20T11:31:33.000+03:00
Also the family name is detected as Noto Sans CJK JP
and not Noto Sans CJK SC
diff --git a/lib/matplotlib/tests/test_font_manager.py b/lib/matplotlib/tests/test_font_manager.py
@@ -118,10 +118,10 @@ def test_find_ttc():
         fig.savefig(BytesIO(), format=fmt)
 
 
-def test_find_otf():
-    fp = FontProperties(family=["Noto Sans CJK SC"])
+def test_find_noto():
+    fp = FontProperties(family=["Noto Sans CJK SC", "Noto Sans CJK JP"])
     name = Path(findfont(fp)).name
-    if name != "NotoSansCJKsc-Regular.otf":
+    if name not in ("NotoSansCJKsc-Regular.otf", "NotoSansCJK-Regular.ttc"):
         pytest.skip(f"Noto Sans CJK SC font may be missing (found {name})")
 
     fig, ax = plt.subplots()
