perl: warning: Please check that your locale settings

Problem: perl: warning: Please check that your locale settings:     LANGUAGE = (unset),     LC_ALL = (unset),     LC_TIME = "en_IN.UTF-8",     LC_MONETARY = "en_IN.UTF-8",     LC_ADDRESS = "en_IN.UTF-8",     LC_TELEPHONE = "en_IN.UTF-8",     LC_NAME = "en_IN.UTF-8",     LC_MEASUREMENT = "en_IN.UTF-8",     LC_IDENTIFICATION = "en_IN.UTF-8",     LC_NUMERIC = "en_IN.UTF-8",     LC_PAPER = "en_IN.UTF-8",     LANG = "en_US.UTF-8"     are supported and installed on your system.

Solution:

$ locale  locale: Cannot set LC_ALL to default locale: No such file or directory  LANG=en_US.UTF-8  LANGUAGE=  LC_CTYPE=en_US.UTF-8  LC_NUMERIC=ru_RU.UTF-8  LC_TIME=ru_RU.UTF-8  LC_COLLATE="en_US.UTF-8"  LC_MONETARY=ru_RU.UTF-8  LC_MESSAGES="en_US.UTF-8"  LC_PAPER=ru_RU.UTF-8  LC_NAME=ru_RU.UTF-8  LC_ADDRESS=ru_RU.UTF-8  LC_TELEPHONE=ru_RU.UTF-8  LC_MEASUREMENT=ru_RU.UTF-8  LC_IDENTIFICATION=ru_RU.UTF-8  LC_ALL=    $ sudo su    # export LANGUAGE=en_US.UTF-8  # export LANG=en_US.UTF-8  # export LC_ALL=en_US.UTF-8    # locale-gen en_US.UTF-8  Generating locales...    en_US.UTF-8... up-to-date  Generation complete.    # dpkg-reconfigure locales  Generating locales...    en_AG.UTF-8... done    en_AU.UTF-8... done    en_BW.UTF-8... done    en_CA.UTF-8... done    en_DK.UTF-8... done    en_GB.UTF-8... done    en_HK.UTF-8... done    en_IE.UTF-8... done    en_IN.UTF-8... done    en_NG.UTF-8... done    en_NZ.UTF-8... done    en_PH.UTF-8... done    en_SG.UTF-8... done    en_US.UTF-8... up-to-date    en_ZA.UTF-8... done    en_ZM.UTF-8... done    en_ZW.UTF-8... done  Generation complete.    # exit    $ locale  LANG=en_US.UTF-8  LANGUAGE=en_US.UTF-8  LC_CTYPE="en_US.UTF-8"  LC_NUMERIC="en_US.UTF-8"  LC_TIME="en_US.UTF-8"  LC_COLLATE="en_US.UTF-8"  LC_MONETARY="en_US.UTF-8"  LC_MESSAGES="en_US.UTF-8"  LC_PAPER="en_US.UTF-8"  LC_NAME="en_US.UTF-8"  LC_ADDRESS="en_US.UTF-8"  LC_TELEPHONE="en_US.UTF-8"  LC_MEASUREMENT="en_US.UTF-8"  LC_IDENTIFICATION="en_US.UTF-8"  LC_ALL=en_US.UTF-8