I installed LXDE on my Jessie laptop for exploring it (alongside GNOME). Now, I removed LXDE from Tasksel and installed Mate desktop. I think only some packages are removed. Also, the gdm (or whatever that's called where we login and select out desktop environment) stills lists LXDE.
I have tried
tasksel remove LXDE
and googled a lot.
Still expecting solution.
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Himanshu Shekhar
IIIT-Allahabad
IRM2015006