The latest Debian based image available in Cloudmin Settings -> New System Images seems to be Ubuntu 16.
The Debian Jessie one gives:
Downloading *Debian Jessie 64-bit LXC container with base OS* version 1.0 ..
.. download of information file failed : HTTP/1.1 404 Not Found
I accessed the page it downloads from and the image is there. I manually imported it and that gives an error when trying to start it:
Starting up test.box ...
.. failed : lxc-start: test.box: confile.c: set_config_net: 288 lxc.net must not have a value lxc-start: test.box: parse.c: lxc_file_for_each_line_mmap: 142 Failed to parse config file "/var/lib/lxc/test.box/config" at line "lxc.network.type = veth" Failed to load config for test.box lxc-start: test.box: tools/lxc_start.c: main: 263 Failed to create lxc_container