[rtems-docs commit] user/hosts/posix.rst: Update Ubuntu instructions.

[Joel Sherrill]

Module:    rtems-docs
Branch:    master
Commit:    9316722c2bac6e524f82274486d47cd61e5ab066
Changeset: http://git.rtems.org/rtems-docs/commit/?id=9316722c2bac6e524f82274486d47cd61e5ab066

Author:    Joel Sherrill <joel at rtems.org>
Date:      Thu Dec 12 16:20:37 2019 -0600

user/hosts/posix.rst: Update Ubuntu instructions.

Note that the ticket has instructions for what to do if the
error message "Error :: You must put some 'source' URIs in your sources.list"
is reported. As this occurred on an Ubuntu version that was not
LTS, it is not being added. If this error occurs in the future on a
LTS release, then add this information.

closes #3416.

---

 user/hosts/posix.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/user/hosts/posix.rst b/user/hosts/posix.rst
index 12bfc94..b46497c 100644
--- a/user/hosts/posix.rst
+++ b/user/hosts/posix.rst
@@ -126,8 +126,9 @@ Xubuntu. A minimal installation was used and the following packages installed:
 
 .. code-block:: none
 
-  $ sudo apt-get build-dep gcc-defaults g++ gdb git unzip pax bison \
-         flex libpython-dev git libncurses5-dev zlib1g-dev
+  $ sudo apt-get build-dep build-essential gcc-defaults g++ gdb git \
+  unzip pax bison flex texinfo unzip python3-dev libpython-dev \
+  libncurses5-dev zlib1g-dev
 
 Note that in previous versions of Ubuntu, the package libpython-dev was
 python2.7-dev. The name of packages changes over time. You need the