GusetVM can't detect and mount CDROM with virt-install

[Takaaki Suzuki]

I had an issue when installing ubuntu-16.04.1-server-arm64.iso with virt-install.

[My commands to reproduce the issue]
root@armtest:~# apt install qemu-kvm qemu-efi libvirt-bin virt-manager
root@armtest:~# systemctl start libvirtd
root@armtest:~# wget http://cdimage.ubuntu.com/releases/16.04.1/release/ubuntu-16.04.1-server-arm64.iso
root@armtest:~# virt-install --boot uefi --virt-type=kvm --name ubuntu160402 --ram 4096 --cpu 2 --cdrom=/root/ubuntu-16.04.1-server-arm64.iso --disk path=/root/ubuntu1604arm.img,size=20

after few steps, The installer says at "[!!] Detect and mount CD-ROM" - "Your installation CD-ROM couldn't be mounted. This probably means that the CD-ROM was not in the drive. If so you can insert it and try again. Retry mounting the CD-ROM? <Yes> <No>".

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Gabor Locsei (gaborlocsei)]

I encountered the same problem when I used 'virtio' for the cdrom. Changing it to 'ide' solved the problem for me. I used an XML file and virsh, I guess it will be something like with virt-install, in the case of the reporter:
--disk bus=ide,device=cdrom,path=/root/ubuntu-16.04.1-server-arm64.iso