How can I append a group after having it linked earlier? I linked a group in from another file, it was a character with armature. After linking it I realize that I don't have control over the armature so I deleted it and decided that I want to append it in instead. But it just won't appear after appending. I tried other groups, in different files, it appears that this is persistent. I can't append any group as long as I have: 1. linked it 2. then delete it. 

How can I solve this problem?
So here is a very simple solution of how to append a group after having previously linked it in or how to simply get rid of an unwanted group instance:


In the Outliner, switch to "Blender File", and open up "Libraries".





Right click the library referencing the linked group, and press "Delete".




You will now be able to immediately append the group as normal, no saving or re-opening required!