Apparently this is the source of the package.
https://launchpad.net/~gnome3-team
I have confirmed that it also occurs by installing this package.
http://packages.ubuntu.com/trusty/libgtk-3-0
Apparently this is the source of the package.
https:/ /launchpad. net/~gnome3- team
I have confirmed that it also occurs by installing this package.
http:// packages. ubuntu. com/trusty/ libgtk- 3-0