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I get an error when running Kivy.

Use kivy for the first time.
Environment:
ubuntu 17.04
python 3.5.3
kivy 1.10.0
Installed in a virtual environment.

Source code
import kivy
from kivy.app import App
from kivy.uix.label import Label
class MyApp (App):
 def build (self):
  return Label (text = "Hello kivy!")
MyApp (). Run ()
Execution results

[INFO] [Logger] Record log in /home/user/.kivy/logs/kivy_18-08-25_25.txt
[INFO] [Kivy] v1.10.1
[INFO] [Python] v3.5.3 (default, Nov 23 2017, 11:34:05)
[GCC 6.3.0 20170406]
[INFO] [Factory] 194 symbols loaded
[INFO] [Image] Providers: img_tex, img_dds, img_pil, img_gif (img_pygame, img_ffpyplayer ignored)
[INFO] [Text] Provider: pil (['text_pygame'] ignored)
[CRITICAL][Window] Unable to find any valuable Window provider.
egl_rpi-ImportError: cannot import name'bcm'
File"/home/user/myenv/lib/python3.5/site-packages/kivy/core/init.py" ;, line 59, in core_select_lib
fromlist = [modulename], level = 0)
File"/home/user/myenv/lib/python3.5/site-packages/kivy/core/window/window_egl_rpi.py" ;, line 12, in<module>
from kivy.lib.vidcore_lite import bcm, egl

pygame-ImportError: No module named'pygame'
File"/home/user/myenv/lib/python3.5/site-packages/kivy/core/init.py" ;, line 59, in core_select_lib
fromlist = [modulename], level = 0)
File"/home/user/myenv/lib/python3.5/site-packages/kivy/core/window/window_pygame.py" ;, line 8, in<module>
import pygame

x11-ImportError: No module named'kivy.core.window.window_windows_x11'
File"/home/user/myenv/lib/python3.5/site-packages/kivy/core/init.py" ;, line 59, in core_select_lib
fromlist = [modulename], level = 0)

[CRITICAL][App] Unable to get a Window, abort.

There are two places where [CRITICAL] is displayed.

This page: https://kivy.org/docs/installation/installation-linux.html
I did a re-installation with reference to, but the execution result does not change.
Does anyone have a solution?