locale::facet::_S_create_c_locale name not valid

[Nicholas.Albion]

When I run ClamAV with the C agent compiled in, I get an error:

$ terminate called after throwing an instance of 'std::runtime_error'
  what():  locale::facet::_S_create_c_locale name not valid
^C
[1]+  Exit 134                sudo .libs/clamd

In case it helps:

$ uname -a
Linux ip-10-13-49-75 3.13.0-48-generic #80-Ubuntu SMP Thu Mar 12 11:16:15 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

$ 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_AU.UTF-8
LC_TIME=en_AU.UTF-8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=en_AU.UTF-8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=en_AU.UTF-8
LC_NAME=en_AU.UTF-8
LC_ADDRESS=en_AU.UTF-8
LC_TELEPHONE=en_AU.UTF-8
LC_MEASUREMENT=en_AU.UTF-8
LC_IDENTIFICATION=en_AU.UTF-8
LC_ALL=

[Nicholas.Albion · Accepted solution]

I found a solution

Debian:

$ apt-get install locales && dpkg-reconfigure locales

Ubuntu:

$ apt-get install locales
$ locale-gen en_US.UTF-8
$ update-locale LANG=en_US.UTF-8
$ reboot