No disk or partitions mounted when installing ubuntu server 18.04.3

Question

I am trying to install ubuntu server using a bootable USB on a DELL EMC PowerEdge R640 Server with (1TB HDD and 800GB SSD), in step 7 / 13, when I have to choose the installation disk, there is no mounted disk available!!. So how I can mount the disks in order to complete the installation.

Thanks

Edit

The 7th step on Ubuntu-server 18.04.3 is equivalent to the 5th step in the official tutorial: https://tutorials.ubuntu.com/tutorial/tutorial-install-ubuntu-server#8 - Here I can't see any mounted disk.

Answer 1

I find the solution here, In order to mount disks you have first to create a virtual disk for your connected disk from the System Setup as explained in the above attached link.