The base image is ubuntu:latest, I’ll try using ubuntu 20.04 instead and see how that goes
That would definitely cause the issue. Did it work with 20.04?
Yeah, that seems to have resolved it, the machines are booting up reliably now.
I’m confused as to how the host kernel affects whether a newer image can boot, I thought firecracker was KVM based, so the host kernel wasn’t shared to the guest?
Right. We are as confused as you are 
but this issue only happens on our older kernel hosts.
The linux KVM module changes a lot as new kernel versions are released. There’s likely an obscur bug breaking a more recent libc. At least that’s my current theory.
@nebula we have upgraded our hosts and it should now be possible to run the latest ubuntu images!
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