The thread above has mentioned a very real problem with snap running on OpenVZ. It requires either squashfs as a kernel module or FUSE+squashfuse. Many OpenVZ hosts will not provide either and docker/k8s is obviously out if you are already operating inside a container...
Like, squashfs is great and all and packaged app images are an acceptable way of delivering desktop apps... but there's so much lossage here when certbot indirectly requires both just for an install.
Frankly at this point I'd happily accept it if certbot required docker or k8s over snap.
At least then I know I'll have to run it in a container (and give up then) instead of waste hours figuring out why I get a snap error message when I try to run/install certbot before finally coming to the conclusion it is impossible.
Like, squashfs is great and all and packaged app images are an acceptable way of delivering desktop apps... but there's so much lossage here when certbot indirectly requires both just for an install.
(I ended up going with acme.sh instead.)