Sometimes an error message will tell you a device (like the sound device or the DVD ROM) is busy, or the file you want to edit is in use. To find the process or processes responsible:
Click System Monitor ▸ Search for Open Files.
Enter a filename or part of a filename. This could be /dev/snd for the sound device or /media/cdrom for the DVD ROM.
This will display a list of running processes that are currently accessing the file or files that match the search. Quitting the program should allow you to access the device or edit the file.
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