TeamViewer is a free remote control, desktop sharing, and file transfer sofrware for linux, windows and mac.
To install TeamViewer on Ubuntu 15.10
1.Go to TeamViewer linux download page and download the .deb file for ubuntu
2.Double click the .deb package file or open with ubuntu software center and click the install button.
3.Type your ubuntu password if needed.
4.Open TeamViewer. To open TeamViewer, click Applications icon from unity launcher. And type TeamViewer in the search applications field. And click TeamViewer to open.