Comment 7 for bug 1535529

I can not unmount the file system after inserting the microSD:

phablet@ubuntu-phablet:~$ mount | fgrep vfat
/dev/mmcblk1p1 on /media/phablet/7895-9F4B type vfat (rw,nosuid,nodev,relatime,uid=32011,gid=32011,fmask=0022,dmask=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remount-ro,uhelper=udisks2)

phablet@ubuntu-phablet:~$ sudo umount /dev/mmcblk1p1
[sudo] password for phablet:
umount: /media/phablet/7895-9F4B: target is busy
        (In some cases useful info about processes that
         use the device is found by lsof(8) or fuser(1).)

phablet@ubuntu-phablet:~$ udisksctl unmount -b /dev/mmcblk1p1
Error unmounting /dev/mmcblk1p1: GDBus.Error:org.freedesktop.UDisks2.Error.DeviceBusy: Error unmounting /dev/mmcblk1p1: Command-line `umount "/media/phablet/7895-9F4B"' exited with non-zero exit status 32: umount: /media/phablet/7895-9F4B: target is busy
        (In some cases useful info about processes that
         use the device is found by lsof(8) or fuser(1).)

phablet@ubuntu-phablet:~$ mount | fgrep vfat
/dev/mmcblk1p1 on /media/phablet/7895-9F4B type vfat (rw,nosuid,nodev,relatime,uid=32011,gid=32011,fmask=0022,dmask=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remount-ro,uhelper=udisks2)