我正在尝试从此 PPA 安装适用于 ubuntu 16.04 的 gnome 桌面，ppa:gnome3-team/gnome3但出现以下错误：
The following packages have unmet dependencies:
ubuntu-gnome-desktop : Depends: adwaita-icon-theme-full but it is not going to be installed
Depends: gdm3 but it is not going to be installed
Depends: gnome-documents but it is not going to be installed
Depends: gnome-session but it is not going to be installed
Depends: gnome-shell but it is not going to be installed
Depends: gnome-shell-extensions but it is not going to be installed
Depends: tracker but it is not going to be installed
Recommends: gnome-music but it is not going to be installed
Recommends: gnome-photos but it is not going to be installed
Recommends: libreoffice-calc but it is not going to be installed
Recommends: libreoffice-style-tango but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
我已尝试过install -f但问题仍未解决！