Hi, thanks for bug report and sorry for the delay.
I've copied a ttf file to a usb key and reproduced your problem
here my fuser result :
[EMAIL PROTECTED]:~$ fuser -v /media/disk/*
USER PID ACCESS COMMAND
/media/disk/webdings.ttf:
gza 20756 ....m kio_thumbnail
** Changed in: kdebase (Ubuntu)
Status: Unconfirmed => Confirmed
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Safely remove does not work if you have ttf files in the device
https://bugs.launchpad.net/bugs/72372
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Team, which is a bug contact for kdebase in ubuntu.
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