doc/install: link to devguide's install from git

Although we have an updated version of instructions for installation
from git, our install guide was only referring to RedMine, which is less
up-to-date.

Kept that reference, since it might still be useful for non-Ubuntu
cases.

doc/userguide/install.rst

@@ -364,5 +364,9 @@ Suricata packages.
 Advanced Installation
 ---------------------
 
-Various installation guides for installing from GIT and for other operating systems are maintained at:
+If you are using Ubuntu, you can follow
+:doc:`devguide/codebase/installation-from-git`.
+
+For other various installation guides for installing from GIT and for other operating
+systems, please check (bear in mind that those may be somewhat outdated):
 https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Suricata_Installation