Hi ... Today I copied (via dd) the Proxmox installer is 5.3.1 iso to a hard drive like /dev/vdb. I rebooted from that device and the Proxmox installer booted up. However, then I hit this issue where the installer is looking for a particular device /dev/sr0 and sr1 as others have mentioned. Clearly, the data is available to the installer which has booted, but I guess not at /dev/sr0. It would be nice if the installer logic could be re-written so that it looks for other places for the files in question. My reason to do it this way on this occasion is unusual -- I have a hosted KVM machine (which happens to be running under Proxmox as hypervisor!) and I wanted to try a nested virtualization setup. The provider does not have the latest Proxmox iso in their list, so I was trying to use the installer I downloaded and copied over to a secondary (virtual) drive. It would have worked I think except for this issue. I guess next step is to ask the provider to make the iso available so it will be mounted as a normal virtual CD-Rom device. Anyone figure out a work-around yet? Thanks.