Whenever creating a document and pressing F1 will produce the document's quick build and will immediately open a new window with the pdf view.
After the upgrade from Ubuntu 14.04 to Ubuntu 14.10 when pressing F1 (even though the shortcut is still created within the settings menu) TeXmaker won't do anything.
I have the same issue. I installed the 4.4.1 deb package for ubuntu 14.10 from the Texmaker website which resolved the issue for me (http://www.xm1math.net/texmaker/download.html#linux)