`gpg: keyserver receive failed: No name` during K8s IT

Executing: /tmp/apt-key-gpghome.gGqC9RwptN/gpg.1.sh --keyserver keys.gnupg.net --recv-key E19F5F87128899B192B1A2C2AD5F960A256A04AF
gpg: keyserver receive failed: No name
The command '/bin/sh -c echo "deb http://cloud.r-project.org/bin/linux/debian buster-cran35/" >> /etc/apt/sources.list &&   apt install -y gnupg &&   apt-key adv --keyserver keys.gnupg.net --recv-key 'E19F5F87128899B192B1A2C2AD5F960A256A04AF' &&   apt-get update &&   apt install -y -t buster-cran35 r-base r-base-dev &&   rm -rf /var/cache/apt/*' returned a non-zero code: 2

$ gpg1 --keyserver keys.gnupg.net --recv-key E19F5F87128899B192B1A2C2AD5F960A256A04AF
gpg: requesting key 256A04AF from hkp server keys.gnupg.net
gpg: key 256A04AF: public key "Johannes Ranke (Wissenschaftlicher Berater) <johannes.ranke@jrwb.de>" imported
gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
gpg: depth: 0  valid:   2  signed:   1  trust: 0-, 0q, 0n, 0m, 0f, 2u
gpg: depth: 1  valid:   1  signed:   0  trust: 1-, 0q, 0n, 0m, 0f, 0u
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)