Thank you for your bug report. It's weird that 6.18 would add that regression seeing the changes in the update
http://launchpadlibrarian.net/715512558/qemu_1%3A6.2+dfsg-2ubuntu6.17_1%3A6.2+dfsg-2ubuntu6.18.diff.gz
Did you correctly install the corresponding qemu-block-extra package?
Thank you for your bug report. It's weird that 6.18 would add that regression seeing the changes in the update
http:// launchpadlibrar ian.net/ 715512558/ qemu_1% 3A6.2+dfsg- 2ubuntu6. 17_1%3A6. 2+dfsg- 2ubuntu6. 18.diff. gz
Did you correctly install the corresponding qemu-block-extra package?