ubuntu-cloud template can't find .img

When creating releases older than precise, i.e.
lxc-create -t ubuntu-cloud -n o1 -- -r oneiric

I get the following error. note that the tarball contains:
oneiric-server-cloudimg-amd64.img, not ubuntu-11.10-server-cloudimg-amd64.img.

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ubuntu@server-8308:~$ sudo lxc-create -t ubuntu-cloud -n cloudl1 -- -r oneiric

No config file specified, using the default config
ubuntu-cloudimg-query is /usr/bin/ubuntu-cloudimg-query
wget is /usr/bin/wget
--2012-04-12 15:34:02-- https://cloud-images.ubuntu.com/server/releases/oneiric/release-20120401/ubuntu-11.10-server-cloudimg-amd64-root.tar.gz
Resolving cloud-images.ubuntu.com (cloud-images.ubuntu.com)... 91.189.88.141
Connecting to cloud-images.ubuntu.com (cloud-images.ubuntu.com)|91.189.88.141|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://cloud-images.ubuntu.com/releases/oneiric/release-20120401/ubuntu-11.10-server-cloudimg-amd64-root.tar.gz [following]
--2012-04-12 15:34:02-- https://cloud-images.ubuntu.com/releases/oneiric/release-20120401/ubuntu-11.10-server-cloudimg-amd64-root.tar.gz
Reusing existing connection to cloud-images.ubuntu.com:443.
HTTP request sent, awaiting response... 404 Not Found
2012-04-12 15:34:02 ERROR 404: Not Found.

Downloading cloud image from https://cloud-images.ubuntu.com/server/releases/oneiric/release-20120401/ubuntu-11.10-server-cloudimg-amd64.tar.gz
--2012-04-12 15:34:02-- https://cloud-images.ubuntu.com/server/releases/oneiric/release-20120401/ubuntu-11.10-server-cloudimg-amd64.tar.gz
Resolving cloud-images.ubuntu.com (cloud-images.ubuntu.com)... 91.189.88.141
Connecting to cloud-images.ubuntu.com (cloud-images.ubuntu.com)|91.189.88.141|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://cloud-images.ubuntu.com/releases/oneiric/release-20120401/ubuntu-11.10-server-cloudimg-amd64.tar.gz [following]
--2012-04-12 15:34:02-- https://cloud-images.ubuntu.com/releases/oneiric/release-20120401/ubuntu-11.10-server-cloudimg-amd64.tar.gz
Reusing existing connection to cloud-images.ubuntu.com:443.
HTTP request sent, awaiting response... 200 OK
Length: 217901063 (208M) [application/x-gzip]
Saving to: `ubuntu-11.10-server-cloudimg-amd64.tar.gz'

100%[===============================================================================================================================>] 217,901,063 15.8M/s in 12s

2012-04-12 15:34:14 (17.2 MB/s) - `ubuntu-11.10-server-cloudimg-amd64.tar.gz' saved [217901063/217901063]

Creating new cached cloud image rootfs
tar: ubuntu-11.10-server-cloudimg-amd64.img: Not found in archive
tar: Exiting with failure status due to previous errors
umount: /var/cache/lxc/cloud-oneiric/./tmp.XAPfavowLw: not mounted
failed to execute template 'ubuntu-cloud'
aborted