[Koha] Koha Upgrade from 3.18 version to 18.05

I have Koha 3.18 version installed using GIT method. Now I have installed on my test machine 18.05 using ubuntu package method. Kindly provide me steps to upgrade to the latest version. I am using serial and acquisition modules. *With Regards,* *Gopalakrishna* *BMSIT*