doc: clarify python and pip2 for ubuntu 20

Must run the pip2 install script with python2 on ubuntu 20.

Signed-off-by: Mark Stapp <mjs@voltanet.io>

diff --git a/doc/developer/building-frr-for-ubuntu2004.rst b/doc/developer/building-frr-for-ubuntu2004.rst
index 92ebb3d803cb34ea996102b181aa5e27e8a44c2a..f7f8c63e5b8b00aae0b321adb66c3238352c5fc3 100644 (file)
--- a/doc/developer/building-frr-for-ubuntu2004.rst
+++ b/doc/developer/building-frr-for-ubuntu2004.rst
@@ -28,7 +28,7 @@ ubuntu apt repositories; in order to install it:
 .. code-block:: shell
 
    curl https://bootstrap.pypa.io/get-pip.py --output get-pip.py
-   sudo ./get-pip.py
+   sudo python2 ./get-pip.py
 
    # And verify the installation
    pip2 --version