Using Kubuntu 10.04 (updated from 9.10) I can no longer securely unmount my USB drives directly from within Dolphin. Instead I get the error message "... Hal.Device.Volume.NotMountedByHal: ....".
Also when using the Device-Applet (in German: Geräteüberwachung) I get the message that there are still files in use.
Nautilus is launched automatically. Choosing unmount there for my USB-drive works fine.
Other people seem to have similar issues:
http://art.ubuntuforums.org/showthread.php?t=1336124
Potentially this has got something to do with the fact, that HAL is not used any more during boot in Ubuntu 10.04?
https://wiki.ubuntu.com/LucidLynx/TechnicalOverview#HAL%20removal
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: dolphin 4:4.4.2-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Tue Jun 8 21:07:33 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
ProcEnviron:
LANGUAGE=en_GB:en
PATH=(custom, user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: kdebase
Is this issue still affecting you? Can you test on Maverick?