I tried to create an Ubuntu-container on my Debian Jessie Server and I got the following error-message:
root@lxc-server.foo:/usr/share/lxc/templates$ lxc-create -n mycontainer -t ubuntu
Checking cache download in /var/cache/lxc/precise/rootfs-amd64 ...
Installing packages in template: ssh,vim,language-pack-en
Downloading ubuntu precise minimal ...
I: Keyring file not available at /usr/share/keyrings/ubuntu-archive-keyring.gpg; switching to https mirror https://mirrors.kernel.org/debian
I: Retrieving Release
E: Failed getting release file https://mirrors.kernel.org/debian/dists/precise/Release
lxc_container: container creation template for sec.toscom.at failed
lxc_container: Error creating container mycontainer
I installed the ubuntu-archive-keyring to fix it:
apt-get install ubuntu-archive-keyring