The following packages have unmet dependencies:

youtube-to-mp3: Depends: libc6 (>= 2.14) but 2.19-0ubuntu6.5 is to be installed
                Depends: libgcc1 (>= 1:4.1.1) but 1:4.9.1-0ubuntu1 is to be installed
                Depends: libqt4-declarative (>= 4:4.7.0~rc1) but 4:4.8.5+git192-g085f851+dfsg-2ubuntu4 is to be installed
                Depends: libqt4-network (>= 4:4.6.1) but 4:4.8.5+git192-g085f851+dfsg-2ubuntu4 is to be installed
                Depends: libqtcore4 (>= 4:4.8.0) but 4:4.8.5+git192-g085f851+dfsg-2ubuntu4 is to be installed
                Depends: libqtgui4 (>= 4:4.8.0) but 4:4.8.5+git192-g085f851+dfsg-2ubuntu4 is to be installed
                Depends: libstdc++6 (>= 4.6) but 4.8.2-19ubuntu1 is to be installed
                Depends: libav-tools (>= 4:0.8.6-0ubuntu0.12.04.1) but 6:9.16-0ubuntu0.14.04.1 is to be installed
                Depends: libavcodec-extra-53 (>= 4:0.8.6ubuntu0.12.04.1) but it is not going to be installed
                Depends: libmp3lame0 (>= 3.99.3+repack1-1) but 3.99.5+repack1-3ubuntu1 is to be installed