gpg: ошибка получения сервера ключей

Executing: /tmp/apt-key-gpghome.ZXoflQHlR5/gpg.1.sh -qq --keyserver pool.sks-keyservers.net --recv-keys ED444FF07D8D0BF6
gpg: keyserver receive failed: No name
Executing: /tmp/apt-key-gpghome.wELogVwz5k/gpg.1.sh -qq --keyserver hkp://pool.sks-keyservers.net:80 --recv-keys ED444FF07D8D0BF6
gpg: keyserver receive failed: No name
This may be a server issue. Please try again later

Вот что я получаю при попытке установить katoolin3 в Ubuntu 20.04:

$ sudo ./install.sh
[sudo] password for silentstorm:
Executing: /tmp/apt-key-gpghome.LsQdt19RYD/gpg.1.sh -qq --keyserver pool.sks.keyservers.net --recv-keys ED444FF07D8D0BF6
gpg: keyserver receive failed: Server indicated a failure
Executing: /tmp/apt-key-gpghome.3JzK82pkYP/gpg.1.sh -qq --keyserver hkp.pool.sks.keyservers.net --recv-keys ED444FF07D8D0BF6
gpg: keyserver receive failed: No name
This may be a server issue. Please try again later