tumbler causes "Cannot unmount because file system on device is busy."
Mounting USB Device in "thunar" and browsing lets "tumbler" generate thumbnails.
If there are video files, like .avi .mp4 etc. the thumbnailing fails (no thumbnails for this files).
Trying to umount the device causes the error "Cannot unmount because file system on device is busy.".
lsof shows, that the process "tumblerd" is active for every video file on the device.
After "pkill tumblerd" it is possible to umount the device.
Also deactivating thumbnailing comletely is a workaround.
DistroRelease: Ubuntu 12.04
Package: tumbler 0.1.24-0ubuntu1
Uname: Linux 3.2.0-24-generic i686
Date: Mon May 7 13:53:44 2012
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423.1)
UpgradeStatus: No upgrade log present (probably fresh install)