Looks like this has been fixed.
/tmp$ for i in {1..10}; do curl -s -I
http://security.ubuntu.com/ubuntu/pool/main/libg/libgd2/libgd3_2.1.1-4ubuntu0.16.04.11_amd64.deb
| grep HTTP; done
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
HTTP/1.1 200 OK
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https://bugs.launchpad.net/bugs/1818117
Title:
random 404s on security.ubuntu.com for libgd2 packages
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