installation - How to install Guest Additions in Lubuntu 13.04 - Ask Ubuntu
Unable to mount the CD/DVD image on VirtualBox - Ask Ubuntu
centos - Unable to mount a shared folder on VirtualBox? - Unix & Linux Stack Exchange
Windows10下VirtualBox6安装扩展功能问题解决记录_「已注销」的博客-CSDN博客
Linuxys: [Solved] Virtualbox: Could not mount the media/drive
TechVolve: "VirtualBox Guest Additions" Installation error - Unable to insert the virtual optical disk
linux - VBox Guest Additions ISO can't be mounted because of VERR_PDM_MEDIA_LOCKED - Super User
VirtualBox Guest Additions Error || Unable to insert the Virtual Optical disk - YouTube
Problema desconocido con Guest Additions · Issue #1293 · sisoputnfrba/foro · GitHub
Linuxys: [Solved] Virtualbox: Could not mount the media/drive
Deep Sukhwani Blogs CS50 Appliance - Error \"Could Not Mount The Media/drive \'/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso\' ( VERR_PDM_MEDIA_LOCKED)\" When Trying To Install VirtualBox Guest Additions | BlogAdda