The Ubuntu file browser does not show hidden files or folders by default, only the files that your user has access to.
默认情况下，Ubuntu文件浏览器不显示隐藏的文件或文件夹，仅显示用户有权访问的文件。
Here’s what file browser looks like when browsing the root file system normally:
这是正常浏览根文件系统时的文件浏览器外观：
As you can see, all of the hidden/system folders are not shown. If you hit Ctrl+H at this screen, you will immediately see all the hidden files:
如您所见，未显示所有隐藏/系统文件夹。 如果在此屏幕上按Ctrl + H，将立即看到所有隐藏的文件：
Fairly useful shortcut key. If you would just prefer to make this be the default setting when using file browser, go to the Edit menu and select Preferences:
非常有用的快捷键。 如果您只想在使用文件浏览器时将其设置为默认设置，请转到“编辑”菜单并选择“首选项”：
Check the “Show hidden and backup files” checkbox, and you should now see the hidden files all of the time.
选中“显示隐藏文件和备份文件”复选框，现在您应该一直看到隐藏文件。
翻译自: https://www.howtogeek.com/howto/ubuntu/view-hidden-files-and-folders-in-ubuntu-file-browser/