[CircleCI] Building Docker image often fails retrieving apt key

[oesteban]

An alternative to the mit server would fix this: apt-key adv --recv-keys --keyserver hkp://pgp.mit.edu:80 0xA5D32F012649A5A9

0xA5D32F012649A5A9
gpg: requesting key 2649A5A9 from hkp server pgp.mit.edu
gpgkeys: key A5D32F012649A5A9 can't be retrieved
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
gpg: keyserver communications error: keyserver helper general error
gpg: keyserver communications error: unknown pubkey algorithm
gpg: keyserver receive failed: unknown pubkey algorithm
The command '/bin/sh -c apt-get update &&     apt-get install -y --no-install-recommends curl bzip2 ca-certificates xvfb &&     curl -sSL http://neuro.debian.net/lists/xenial.us-ca.full >> /etc/apt/sources.list.d/neurodebian.sources.list &&     apt-key adv --recv-keys --keyserver hkp://pgp.mit.edu:80 0xA5D32F012649A5A9

[effigies]

The SKS Keyserver pools may be useful. Perhaps the high-availability pool <ha.pool.sks-keyservers.net>?

The key has properly propagated to those servers:

$ apt-key adv --recv-keys --keyserver hkp://ha.pool.sks-keyservers.net 0xA5D32F012649A5A9
Executing: /tmp/tmp.9TY0D5Mqca/gpg.1.sh --recv-keys
--keyserver
hkp://ha.pool.sks-keyservers.net
0xA5D32F012649A5A9
gpg: requesting key 2649A5A9 from hkp server ha.pool.sks-keyservers.net
gpg: key 2649A5A9: "NeuroDebian Archive Key <pkg-exppsy-maintainers@lists.alioth.debian.org>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1