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My guess is that something is being written within the directory, or you have something running within the directory. Out of curiosity, is this directory on a seperate drive?
Distribution: Ubuntu, Debian, Various using VMWare
Posts: 2,088
Rep:
If /home/download is on a separate drive or partition, then you can umount. If it is just a subdirectory of /home, then you can't. You can umount /home if it is on a separate drive though.
When you umount, your Present Working Directory can not on the device you are umounting. To find out, use the command "pwd". Eg: if pwd is /home/download/ then you can not umount /home/download
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