The simplest way since you are asking for Ubuntu support is to install Samba (as well as many thousands of apps) using Ubuntu's commandline apt tool. Install from the default repository.

To get to the commandline interface, hit this keyboard shortcut: Ctrl+Alt+T.

Then at the run this at the terminal prompt:

$ sudo apt install samba

Edit the/etc/samba/smb.conf file to create the shares you want to provide on the server.

Create the directory you want to share (or use a directory you already have) then add the share to the smb.conf file.

Creating a shared folder:

$ sudo mkdir -p /mnt2/mysharedfolder

Add the share to the server:

Sample share entry (/etc/samba/conf):

[sharedfolder]
        comment = My Server Shared Folder
        path = /mnt2/mysharedfolder
        force user = user1
        writeable = yes
        browseable = yes
        create mask = 0700
        valid users = user1, user2

Change user# for real user names that you have created on your server and created a samba account.

Create the samba account with:

$ sudo smbpasswd -a user1

Other available configurations such as mask are explained in details in the notes of the /etc/samba/smb.conf file. You can also access the manual using the commands man samba or man smb.conf.

After making a change to the /etc/samba/smb.conf be sure to restart the samba server with:

$ sudo systemctl restart smbd

You might consider upgrading your Ubuntu OS to the lastest LTS version, which currently is version 16.04, which will be supported with release updates for the next 5 years. A non lts version will have release updates for less than a year.