http://docs.frrouting.net/en/latest/installation.html#installation

If you want to use packages, download the package from the link Donald sent and install it with dpkg.

If you don’t know how to install something with dpkg:
https://unix.stackexchange.com/questions/159094/how-to-install-a-deb-file-by-dpkg-i-or-by-apt

If you want to build from source:
http://docs.frrouting.net/en/latest/installation.html#getting-the-source

Since you did not specify your Ubuntu version, here are all of the version specific building docs for Ubuntu we have:

12.04: http://docs.frrouting.org/projects/dev-guide/en/latest/building-frr-on-ubuntu1204.html
14.04: http://docs.frrouting.org/projects/dev-guide/en/latest/building-frr-on-ubuntu1404.html
16.04: http://docs.frrouting.org/projects/dev-guide/en/latest/building-frr-on-ubuntu1604.html
18.04: http://docs.frrouting.org/projects/dev-guide/en/latest/building-frr-on-ubuntu1804.html

On Jul 2, 2018, at 2:54 PM, Daniel Guerri <guerrid@gmail.com> wrote:

Dears 
Im new in FRR routing tool set and Im trying to install it on my UBUNTU server machine.
Can you provide me with a step by step to install it.
Best Regards
Daniel
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