"Perl: warning: Setting locale failed". Locale not available.
 

I've tried the usual avenues (namely Google), but none of the solutions offered seem to work!
The problem in short is the following. Whenever I open my bash shell, I get the following annoying message:
I am running Debian 9 and I have installed all the locales. My own locale though (en_KE, for Kenya) is not among the available locales.
Any suggestions would be much appreciated!

In your .bashrc or .bash_profile, add
That should do.

Thanks Lougavulin. But that didn't work!

Did you reload your .bashrc or .bash_profile ?

So to test it :
Should return your error.

According to my tests, that should work.

If it does, modify your .bashrc or .bash_profile, or if you are root on the system add it somewhere into /etc/profile.d/.

please show us:
also, check if en_KE is available at all:
lastly, read this: https://wiki.debian.org/Locale

Thank you to everyone who's taken the time to respond!
Yes, lougavulin, I reloaded .bashrc
Meanwhile,
gives no response.
Results for locale -a:
Grepping for "en_KEN" in "/usr/share/i18n/SUPPORTED" returns no results.
Appending "export LANG=en_KE.UTF-8" to my .bashrc file gets rid of the "Setting locale failed" message, but only in the current tab.

i think you need to actually install some locales.
i think you can only use those that show up when you issue 'locale -a'. there's no english at all???

please read the wiki i linked.

and yes, it seems that en_KE is unavailable.

The solution in this case (on KDE) was as follows:
Go to KDE System Settings -> Regional Settings -> Formats. Change region from Kenya (en_KE) to United Kingdom (en_GB). No more perl setting locale failed warnings!