Perl warning Setting locale failed in Ubuntu

Perl Locale Warning.
The warnings could be irritating, especially when installing any application. The warnings are also visible when some commands are run

The warnings look like:
perl: warning: Falling back to the standard locale ("C").
locale: Cannot set LC_ALL to default locale: No such file or directory
 
and when you run Run locale from the commandline

bonkhi@sparda-coven:$ 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=en_NG.UTF-8

LC_TIME=en_NG.UTF-8

LC_COLLATE="en_US.UTF-8"

LC_MONETARY=en_NG.UTF-8

LC_MESSAGES="en_US.UTF-8"

LC_PAPER=en_NG.UTF-8

LC_NAME=en_NG.UTF-8

LC_ADDRESS=en_NG.UTF-8

LC_TELEPHONE=en_NG.UTF-8

LC_MEASUREMENT=en_NG.UTF-8

LC_IDENTIFICATION=en_NG.UTF-8

LC_ALL=

To solve this, generate the missing locale

locale-gen en_US.UTF-8

Set the missing locale

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
dpkg-reconfigure locales

How do you reset the circuit protection on Yamaha RX-v373?

Yamaha RX-V373 AV receiver's protection circuity is activated when there is fluctuation in power three (3) consecutive times. This protection mode disables the capability to "turn on" the device.

To disable this:

Hold "Info + Tone Control + Straight" for at least five seconds, while still holding, press the "Power" button.

Manually reboot the AVR for normal operation.