The "Safely Remove" command is available from the drop down menu which opens when you click on the icon on the very left side of the location bar and only when you're actually in the file tree of media device. When you try to click the option to eject the device it's reported to be in use by another application and can not be safely removed. Also would be cool to have a shortcut for that command to eject a media without using mouse.
I have not that issue while unmounting from krusader. The fact that system reports you about device being used by another application is probably true. Did you try same with Dolphin on that case?
As Rafael says, it is likely that this is not related to Krusader. Please try to reproduce it with Dolphin and post the output of lsof /path/to/mountpoint
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!