pi@raspberrypi:~ $ sudo locale-gen en_US.UTF-8
Generating locales (this might take a while)...
  en_GB.UTF-8... done
Generation complete.
pi@raspberrypi:~ $ sudo update-locale LANG=en_US.UTF-8
*** update-locale: Error: invalid locale settings:  LANG=en_US.UTF-8
pi@raspberrypi:~ $ locale
LANG=en_GB.UTF-8
LANGUAGE=
LC_CTYPE="en_GB.UTF-8"
LC_NUMERIC="en_GB.UTF-8"
LC_TIME="en_GB.UTF-8"
LC_COLLATE="en_GB.UTF-8"
LC_MONETARY="en_GB.UTF-8"
LC_MESSAGES="en_GB.UTF-8"
LC_PAPER="en_GB.UTF-8"
LC_NAME="en_GB.UTF-8"
LC_ADDRESS="en_GB.UTF-8"
LC_TELEPHONE="en_GB.UTF-8"
LC_MEASUREMENT="en_GB.UTF-8"
LC_IDENTIFICATION="en_GB.UTF-8"
LC_ALL=
pi@raspberrypi:~ $  Provide the entire answer in JSON format.
user