I’ve tested this on two machines: one is 4.0.5 LTS and one is 4.13:
$ lxc launch images:ubuntu/focal/cloud testcontainer Creating testcontainer Error: Failed instance creation: invalid character '\x00' after top-level value
It occurs with any image on that server, but I can create a container from the
ubuntu-minimal image server without issues.
I tried issuing
lxc image refresh images:ubuntu/focal/cloud but it seems that is only for private remotes.
I haven’t dug into the code yet to see what might actually be failing but I suspect there’s a metadata issue somewhere on the image server?