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dcihon@mx:~$ sudo apt install xfce4-vala-appmenu-plugin unity-gtk3-module unity-gtk2-module appmenu-qt appmenu-qt5
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package appmenu-qt5 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Unable to locate package xfce4-vala-appmenu-plugin
E: Unable to locate package unity-gtk3-module
E: Unable to locate package unity-gtk2-module
E: Package 'appmenu-qt5' has no installation candidate