How to install xfce on PureOs?

Hey guys, is installing xfce on PureOS still a doable thing?
I’ve thought of switching over to Xubuntu for my laptop (because GNOME is too much a resource hog for me), but I paid ~$70 (incl. shipping) to get my thinkpad X200t librebooted, and I’d like to stick with a fully libre distro that’s also somewhat user friendly. So I’m staying with PureOS, for now (and hopefully a long while). I just really need to get out from under GNOME.

Anyway, here’s the error I’m getting when I try the above-mentioned commands:

[chewie@falcon ~]$ sudo apt install task-xfce-desktop xfce4-goodies
[sudo] password for chewie: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 task-xfce-desktop : Depends: lightdm but it is not going to be installed
                     Depends: light-locker but it is not going to be installed
                     Recommends: xfce4-mixer but it is not installable
E: Unable to correct problems, you have held broken packages.

(Latest PureOS, by the way:)

[chewie@falcon ~]$ cat /etc/debian_version 
buster/sid