How to fix setlocale error in Raspberry Pi OS
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):
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Run raspi-config from the command line.
sudo raspi-config
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Choose Localisation Options from the main interface.
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Choose Change Locale from the menu.
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De-select locales that you don't need (optional). en_GB.UTF-8 UTF-8 is installed by default and could be removed.
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Select en_US.UTF-8 UTF-8 from the list and press Ok.
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Select en_US.UTF-8 in the next screen
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The selected locales will be generated, and you should no longer get the error.
Generating locales (this might take a while)... en_US.UTF-8... done Generation complete.