I hear that a new Thunar (with tabs!!) is ready - see this.

I have added the PPA and run the update and upgrade commands but I still have Thunar 1.2.3

In Synaptic, Thunar looks ready for upgrade:

It asks to uninstall some XFCE stuff that I might hope to reinstall later

but then something is fishy

Is this new version limited to the Xfce desktop?

Also, now, when I try Update Manager, I get this:

and

...unless I remove the xubuntu-dev/xfce-4.12 PPAs.

So, removing Thunar in Synaptic and all that seems related to it, and then adding those PPAs, and trying to install Thunar, the following info emerges:

What is to be done?