Fixing missing locale warnings in bash

Recently I have been getting some locale warnings when doing an scp (while trying the bash completion):

$ locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=en_SG.UTF-8
LANGUAGE=en_SG:en
LC_CTYPE="en_SG.UTF-8"
LC_NUMERIC="en_SG.UTF-8"
LC_TIME="en_SG.UTF-8"
LC_COLLATE="en_SG.UTF-8"
LC_MONETARY="en_SG.UTF-8"
LC_MESSAGES="en_SG.UTF-8"
LC_PAPER="en_SG.UTF-8"
LC_NAME="en_SG.UTF-8"
LC_ADDRESS="en_SG.UTF-8"
LC_TELEPHONE="en_SG.UTF-8"
LC_MEASUREMENT="en_SG.UTF-8"
LC_IDENTIFICATION="en_SG.UTF-8"
LC_ALL=

To fix it, just type sudo dpkg-reconfigure locales and select the locales you want to rebuild (in my case, en_SG.UTF-8). The warning should be gone.