You'll get the following error in Raspberry Pi OS when locale is not properly set.
-bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
You can easily fix this via Raspberry Pi Software Configuration Tool (raspi-config).
Steps to fix setlocale error in Raspberry Pi (Raspberry Pi OS):
from the command line.
Choose Localisation Options
from the main interface.
Choose Change Locale
from the menu.
De-select locales that you don't need (optional). en_GB.UTF-8 UTF-8
is installed by default and could be removed.
Select en_US.UTF-8 UTF-8
from the list and press Ok
in the next screen
The selected locales will be generated, and you should no longer get the error.
Generating locales (this might take a while)...
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