当您登录或切换用户时，会看到一个用户列表和他们的登录头像，您也可以更改自己的图片，或者就用自己的像片，您甚至可以用摄像头拍一张作登录图片。
You need administrator privileges to edit user accounts other than your own.
Open the Activities overview and start typing Users.
Click Users to open the panel.
If you want to edit a user other than yourself, press Unlock in the top right corner and type in your password when prompted.
点击用户名旁边的图片，出来一个下拉菜单显示可供选择的登录图片，如果您喜欢其中的图片，点击它作为自己的头像。
If you would rather use a picture you already have on your computer, click Select a file….
If you have a webcam, you can take a new login photo right now by clicking Take a picture…. Take your picture, then move and resize the square outline to crop out the parts you do not want. If you do not like the picture you took, click Take Another Picture to try again, or Cancel to give up.
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