On my host system (Windows 8 Pro 64 Bit), I installed VirtualBox (4.2.12) and installed Ubuntu 12.04 32 Bit as guest system. I also installed the VirtualBox guest utilities to create shared folders.
Now, after creating a shared folder, I added my user id to the group
vboxsf, which is the owner of the shared folder with
sudo usermod -a -G vboxsf <my-user-id>
After a re-login to the Ubuntu system, I can access the shared folder and create a text file in it. But when using a text editor like gedit or Geany, I encounter a strange problem. When I try to save the file, the original file will be removed from the disk and gedit tells me
Could not save the file /media/sf_shared_folder/test.txt and
Unexpected error: Error renaming temporary file: Text file busy
Why there are conflicts when I am already in the group? And how to solve them?