Looks like the rbd driver has been broken out into a separate package[1]
qemu-block-extra
If you install that does that fix your issue?
1. qemu (1:2.2+dfsg-6exp) unstable; urgency=medium
Since Debian release 2.2+dfsg-6exp, a new package named qemu-block-extra
has been created and some less frequently used block backends has been
split out of main qemu-system binaries and from qemu-img binary to
this new package. The backends which has been split are:
curl
iscsi
rbd (ceph/rados)
ssh
If you use any of these, please install qemu-block-extra package in
addition to qemu-system-* or qemu-utils package, because without it
these block backends wont work anymore.
** Changed in: qemu (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1495895
Title:
Unable to attach rados block device to instances
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