On Sun, 22 May 2016 17:12:35 +0200, Emninger wrote:
> Anyone here knows, why the hell the installation of xpdf (in devuan)
> needs to deinstall lxde and lxde-desktop-tasks?

Does it? I was unable to locate any dependencies in lxde
or xpdf that might form such a mutual exclusion. What was
the actual error message you got?

[...]
> Me, as a simple user, i would like to suggest, that capable people step
> by step might have a look in all this dependency spiderweb (with the
> obvious target to cut all of it which not really is needed).
[...]

I am certain almost nobody would object to that proposal.
But it would need a notable number of people to step up
and act as package maintainers to accomplish the task,
namely to cut down to a tolerable size that giant maze of
dependencies created by generations of Debian maintainers.

"Fun" fact: Looking for a possible reason for your apparent
problem I stumbled upon that gem: The lxde package depends
on, among others, galculator and gpicview. Seriously, WTF?

Regards
Urban