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With Ubuntu 18.04.1 on a fresh install, I sometimes cannot unmount my data backup partition. I was dd'ing a Linux iso from the partition /dev/sdb4 to a USB drive. Later, I exited the terminal, and tried to unmount from the nautilus unmount option. The error message shows "Volume is busy".

Error unmounting block device 8:19: GDBus.Error:org.freedesktop.UDisks2.Error.DeviceBusy: Error unmounting /dev/sdb4: target is busy

I ran lsof and this is the result:

:~$ sudo lsof |grep sdb3
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
  Output information may be incomplete.
jbd2/sdb3 4532                  root  cwd       DIR                8,2      4096          2 /
jbd2/sdb3 4532                  root  rtd       DIR                8,2      4096          2 /
jbd2/sdb3 4532                  root  txt   unknown                                         /proc/4532/exe

So, I have to do a lazy unmount to detach the partition. Is there any solution for this? Is this linked to systemd.

Confguy2016
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1 Answers1

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This just happened to me today. I used this command to figure out which process was keeping the drive busy.

sudo fuser -vm /mnt/dir</code>

From manual, -vm comes from --verbose and --mount, and the mounting point (like /mnt/dir... `/media/$USER/...).

This command needs to be run as root.

I found the solution here.

Pablo Bianchi
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IceMonkee
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