That’s typical behavior and a soft failure when automatically configuring IPv6/IPv4 support.
Reproduced on a fresh 8 GB image; ClamAV package names changed with 0.101.5 released on February 25. I’ll resubmit a new image to DigitalOcean with the correct callback and package definitions.
Alternatively… prior to kicking off installation:
sed -i -e 's!json!default!' /root/resume_apnscp_setup.sh
pushd /usr/local/apnscp
env UPDATE_POLICY=edge BSCHECK=0 "/usr/local/apnscp/build/upcp.sh" --reset
popd
./resume_apnscp_setup.sh
That should tide you over until they OK the next image. 
Edit: submitted revised image, waiting on approval.