Comment 5 for bug 1319554

tumbler prevents volume from being unmounted. The volume content consists of jpg, png, mov and MP4 files.

Here's the terminal output when trying to unmount the volume:

~$ fusermount -u ./private
fusermount: failed to unmount /home/slickymaster/private: Device or resource busy

Running 'fuser -m' on the mount point to see what processes are currently using the filesystem:

~$ fuser -m ./private
/home/slickymaster/private: 3829

Getting the process name:

~$ cat /proc/3829/cmdline
/usr/lib/i386-linux-gnu/tumbler-1/tumblerd

The only possible way to get the volume to unmount is by manual killing the culprit process:

~$ kill 3829
~$ fusermount -u ./private
~$

~$ apt-cache policy tumbler
tumbler:
  Installed: 0.1.30-1ubuntu1
  Candidate: 0.1.30-1ubuntu1
  Version table:
 *** 0.1.30-1ubuntu1 0
        500 http://pt.archive.ubuntu.com/ubuntu/ trusty/universe i386 Packages
        100 /var/lib/dpkg/status

~$ lsb_release -a && uname -r
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty
3.16.0-031600-generic