It's an orphaned $ID - delete it.
"Man-wai Chang ToDie (33.6k)" wrote in message
...
What's the appropriate method of dealing them? Could I just remove them?
Probably - but where are you seeing these "Account Unknown"? are they on
Permission lists for objects such as files and folders - in which case
you probably can remove them.
In the Security tag of the file/folder's properties.
I guess I could delete them.
But what if this "Account Unknown" owns a folder? 
Also your use of Xubuntu appears to have damaged your keyboard as the
product name is Vista with an "s" not a "$"
It's another PC (home server), not the workstation where I finish most of
my personal tasks, including games of course.
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