The following shell command deletes all containers that start with the name juju:
lxc list --format=csv --columns=n juju | xargs lxc delete --force
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For some reason the profile list in lxc doesn’t have a format flag, so you have to do some jumping through hoops to remove all the profiles…
lxc profile list | grep juju | tr -s ' ' | cut -d ' ' -f 2 | xargs -I % echo "lxc profile delete %" | sh
TBH: I could just file a PR in my spare time 
To be fair, there should still be a bug you’re working against if you were to put up a PR. 
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