apt sources (or the lack of)

#1 (Shotwell) Developer repo

Reading package lists... Done E: The repository 'http://ppa.launchpad.net/yg-jensge/shotwell/ubuntu yakkety Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

#2
I always switch default file-browser to nemo. (Exept handling the desktop which brakes unity handling backgrounds etc).

Well this isnt exactly a problem because it seems nemo is no longer dependant on the entire ciamon desktop being installed. But i usually use this source: http://www.webupd8.org/2013/10/insta...tches-and.html

I did not notice the "apt release error" when i updated and simply "sudo apt-get install nemo nemo-fileroller".
This worked fine with the yakkety repositories.