running some programs will give this result , this is happened with different applications one of them vrms
will give this issue:
user@host:~$ vrms
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = "",
LC_ALL = (unset),
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
No non-free or contrib packages installed on host! rms would be proud.
user@host:~$
something needs to be installed ? or we just ignore it?