Send file via NFC from Galaxy S2 Plus and Sony vaio with Ubuntu OS
You can try Airdroid as it available even for Ubuntu OS. It is one of the easiest way to transfer from PC to mobile or vice versa.

Go to Google Store and look for Airdroid and have it in your mobile.
On browser type - http://web.airdroid.com
Put in your user name and pass -> Boom you will have complete control of your mobile from your system.

If you like to know Airdroid's feature then you can check this out - Airdroid Features