[SOLVED] Warning message on update

[TWPonKubuntu]

For the last several months I've seen this warning message when I do a normal CLI update and dist-upgrade:

update-initramfs: Generating /boot/initrd.img-4.8.0-52-generic
Warning: No support for locale: en_US.utf8

The kernel number has changed as newer kernels are released, but the warning remains.

The warning is because the locale is actually all caps "EN_US.UTF8", but the script is in mixed case.

My question: Where is the script which contains this incorrect locale text?

DO NOTE: this is not a "game over" type error. But it has existed for month and I've not seen any mention of a fix being applied by the devs...

[TWPonKubuntu]

I'm going to answer my own question and mark this solved.

https://www.rtcx.net/warning-no-support-locale.html

It is a know glitch, going back to 2012 or thereabouts.