Ubuntu locale warning

While working on my personal Ubuntu server, I often run into the following locale warnings.

perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = "en_US:en", LC_ALL = (unset), LC_CTYPE = "nl_BE.UTF-8", LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). locale: Cannot set LC_CTYPE to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory

First you should check if there is anything wrong with your locales. Execute the following commands:

locale-gen en_US.UTF-8 sudo dpkg-reconfigure locales

Funny enough, the warning messages also appear when executing that last command. If we inspect the warning messages we see that LC_ALL is not set. You can set this value by adding it to the /etc/default/locale file:

LANG="en_US.UTF-8" LANGUAGE="en_US:en" LC_ALL="en_US.UTF-8"

There you go, relog and the warnings should be gone.