I am not able to select the iso file for ubuntu installation of a virtual machine
I would like to install a Linux Ubuntu OS on a virtual machine. I use the program VirtualBox from Oracle for it. The problem is that I can not select an iso file. I watched some tutorials about this but there it works without any problem. Here at my end, the upload icon is grey and I can not click on it. It does not work somehow. What am I doing wrong there?