Oracle VM VirtualBox is cross-platform virtualization software. It allows to run multiple operating systems including Microsoft Windows, Mac OS X, Linux, and Oracle Solaris, at the same time.
How to reproduce it
Open a file in the shared folder with gedit application.
Could not save the file “/home/developer/shared/test.txt”. Unexpected error: Error renaming temporary file: Text file busy
Use another text editor, e.g. nano or Visual Studio code.