locale: Cannot set LC_ALL to default locale: No such file or directory

now and then this happenes to me on a new machine. usually I just set
LC_ALL, LC_LANG & LANGUAGE like this

root@gargamel:~# cat /etc/profile.d/locale 
export LANGUAGE = "en_US.UTF-8"
export LC_ALL = "en_US.UTF-8"
export LANG = "en_US.UTF-8"

still it complains about missing default locale. so we hafta do this:

localedef -v -c -i en_US -f UTF-8 en_US.UTF-8 

because usually en_US is probably defined.
we r done. we give back to the connected funk-haeusers!