I tried to install your ppa into ubuntu 14.04 - 64 bit but I got these errors
The following packages have unmet dependencies:
octave: Depends: libgcc1 (>= 1:4.1.1) but 1:4.9.1-0ubuntu1 is to be installed
Depends: libglpk36 (>= 4.51) but 4.52.1-2build1 is to be installed
Depends: liboctave3 (= 4.1.0+hg20150613.20259.4c426eb2eb53-0~ppa1~trusty1) but 4.1.0+hg20150613.20259.4c426eb2eb53-0~ppa1~trusty1 is to be installed
Depends: libgl1-mesa-glide3 but it is not going to be installed
Depends: libportaudio2 (>= 19+svn20101113) but 19+svn20140130-1 is to be installed
Depends: libqt4-network (>= 4:4.5.3) but 4:4.8.5+git192-g085f851+dfsg-2ubuntu4.1 is to be installed
Depends: libqt4-opengl (>= 4:4.5.3) but 4:4.8.5+git192-g085f851+dfsg-2ubuntu4.1 is to be installed
Depends: libqtcore4 (>= 4:4.7.0~beta1) but 4:4.8.5+git192-g085f851+dfsg-2ubuntu4.1 is to be installed
Depends: libqtgui4 (>= 4:4.8.0) but 4:4.8.5+git192-g085f851+dfsg-2ubuntu4.1 is to be installed
Depends: libstdc++6 (>= 4.6) but 4.8.4-2ubuntu1~14.04 is to be installed
Depends: octave-common (= 4.1.0+hg20150613.20259.4c426eb2eb53-0~ppa1~trusty1) but 4.1.0+hg20150613.20259.4c426eb2eb53-0~ppa1~trusty1 is to be installed