This application failed to start because it could not find or load the Qt platform plugin "xcb"
Well yeah great information there what exactly am I to install?
Reinstalling Octopi did not pull the needed xcb stuff either.
Then I remembered that I had removed my orphans
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pacman -Rs $(pacman -Qqdt)
So that would give me a clue.
Normally I think logs are for sissies but now I really needed to check what xcb stuff that was removed so I did a
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cd /var/cache/pacman/pkg/
After some "ls-ing" I found two xcb related entries there that were no longer installed:
xcb-util-cursor and xcb-util-renderutil
Well since that was in the cache and the only stuff named xcb something - the rest was easy:
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sudo pacman -S xcb-util-cursor xcb-util-renderutil
And oh wonder: Octopi fired just fine.
So the lesson is: Removing orphans is true Berserk stuff that needs you to be awake ... and checking the cache (chicken stuff) to fix the fubar is the medicine