$ apt search language-pack- 
$ sudo apt install language-pack-zh-hans language-pack-zh-hans-base
$ sudo apt install language-pack-en language-pack-en-base

$ localectl			# display current settings
$ localectl list-locales	# display the list of locale

$ sudo localectl set-locale LANG=en_US.UTF-8
$ sudo localectl set-keymap us
$ sudo localectl set-x11-keymap us