Well, this is new. On a apt-get upgrade:
W: The repository 'http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-builddeps-r14.0.x xenial Release' does not have a Release file. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details. W: The repository 'http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-r14.0.x xenial Release' does not have a Release file. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details.
Ubuntu 16.04 using Trinity 14.07 with Preliminary Stable build.
Jonesy