The required package garcon-gtk3-1 was not found on your system.

ii  libgarcon-1-0              0.5.0-0ppa1+gtk3~1 amd64              freedesktop.org compliant menu implementation for Xfce (gt
ii  libgarcon-1-0-dev          0.5.0-0ppa1+gtk3~1 amd64              Development files for garcon (gtk2)
ii  libgarcon-2-0              0.5.0-0ppa1+gtk3~1 amd64              freedesktop.org compliant menu implementation for Xfce (gt
ii  libgarcon-2-0-dev          0.5.0-0ppa1+gtk3~1 amd64              Development files for garcon (gtk3)
ii  libgarcon-common           0.5.0-0ppa1+gtk3~1 all                common files for libgarcon menu implementation