ref-manual: use standardized method accross both ubuntu and debian for locale install

Modify locale installation method to be standard accross all debian-based distributions.
Pre-existing method is available only on Ubuntu, locale-gen tool has no parameter in Debian.

(From yocto-docs rev: 30002019198a168e48537407bb928facb26af82a)

Signed-off-by: Guénaël Muller <guenael.muller@smile.fr>
Reviewed-by: Yoann Congal <yoann.congal@smile.fr>
Reviewed-by: Antonin Godard <antonin.godard@bootlin.com>
Tested-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/documentation/ref-manual/system-requirements.rst b/documentation/ref-manual/system-requirements.rst
index 0fc92550a5..43c3c5834b 100644
--- a/documentation/ref-manual/system-requirements.rst
+++ b/documentation/ref-manual/system-requirements.rst
@@ -152,8 +152,25 @@ with a supported Ubuntu or Debian Linux distribution::
 
    $ sudo apt install &UBUNTU_HOST_PACKAGES_ESSENTIAL;
 
+You also need to ensure you have the ``en_US.UTF-8`` locale enabled::
+
+   $ locale --all-locales | grep en_US.utf8
+
+If this is not the case, you can reconfigure the ``locales`` package to add it
+(requires an interactive shell)::
+
+   $ sudo dpkg-reconfigure locales
+
 .. note::
 
+   -  If you are not in an interactive shell, ``dpkg-reconfigure`` will
+      not work as expected. To add the locale you will need to edit
+      ``/etc/locale.gen`` file to add/uncomment the ``en_US.UTF-8`` locale.
+      A naive way to do this as root is::
+
+         $ echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
+         $ locale-gen
+
    -  If your build system has the ``oss4-dev`` package installed, you
       might experience QEMU build failures due to the package installing
       its own custom ``/usr/include/linux/soundcard.h`` on the Debian