Ubuntu 16.04 comes with Samba, so you can use it directly.
right click on the folder you want to share -> Local Network Share, all points can be determined, and it can be done.
if the following error occurs:

'net usershare' returned error 255: net usershare: cannot open usershare directory /var/lib/samba/usershares. Error Permission denied 
You do not have permission to create a usershare. Ask your administrator to grant you permissions to create a share

Perform the following steps to resolve:
Add your username to sambashare.

sudo adduser yourname sambashare

Log out, Log in again, and execute Local Network Share.