[Bug 1894139] [NEW] Cannot install KVM guest from Focal Live Server ISO image but Legacy ISO works

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I was trying to set up a Focal KVM guest just now and cannot get the
20.04.1 release Live Server image to boot in KVM.  I downloaded from
releases.ubuntu.com and verified that the SHA256 sums check out (they
do).  ALso, just to be doubly sure, I downloaded the image a second time
and verified that one as well.

When I try booting the image as a CD/DVD on my KVM guest (using virt-
manager on my 18.04 desktop system), the guest fails to boot with the
error message:

Boot failed: could not read from CDROM (code 0009)

I tried changing the CDROM drive in KVM settings between IDE, SATA and
SCSI with no change.

I also tried, as mentioned above, booting the image after downloading it
a second time, just to be sure, and that failed.

I next downloaded the Focal legacy image from cdimages.ubuntu.com, that
one booted immediately and allowed me to proceed installing my KVM
guest.

I have KVM/Qemu version 1:2.11+dfsg-1ubuntu7.31 from Bionic Updates
installed as well as libvirt 4.0.0-1ubuntu8.17, also from Updates.

So, to summarize:
20.04.1 Live Server ISO - no boot in KVM
Focal Legacy Server ISO - Successful boot in KVM

Both images are the AMD64 ISOs.

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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Cannot install KVM guest from Focal Live Server ISO image but Legacy ISO works
https://bugs.launchpad.net/bugs/1894139
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