Answers:
弄清楚了。
从https://wiki.gnome.org/Projects/GnomeShellIntegrationForChrome/Installation#Troubleshooting:
sudo rm /etc/opt/chrome/policies/managed/chrome-gnome-shell.json
sudo rm /etc/chromium/policies/managed/chrome-gnome-shell.json
我还必须执行以下步骤:
sudo apt remove chrome-gnome-shell