Just FYI this bug is still in a 12.10 distro update done as recently as 48 hours ago through Update Manager.
This was a distro update to a "Ubuntu Studio" install of great vintage.
A USB card reader with a CF card inserted would appear in Nautilus but clicking on the card generated the "Adding read ACL for UID ..." error.
As per above saying 'sudo mkdir $USER' in /media/ (and for good measure saying 'chmod go+w ./$USER') solved the problem.
Just FYI this bug is still in a 12.10 distro update done as recently as 48 hours ago through Update Manager.
This was a distro update to a "Ubuntu Studio" install of great vintage.
A USB card reader with a CF card inserted would appear in Nautilus but clicking on the card generated the "Adding read ACL for UID ..." error.
As per above saying 'sudo mkdir $USER' in /media/ (and for good measure saying 'chmod go+w ./$USER') solved the problem.