3 installing a meta packages like "task-xfce-desktop" and later removing (and auto-removing unneeded dependencies) does not remove all of the packages that were originally installed.
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8 <petn-randall> cweiske: If some other package recommends/suggests any of those packages, they won't get removed.
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10 <petn-randall> cweiske: You can see which packages got installed via /var/log/apt/history.log, then just remove them.