Underc0de

root@inventory-server:~# apt-key adv --recv-keys --keyserver hkp: //keyserver.ubuntu.com: 80 0xF1656F24C74CD1D8
Executing: /tmp/apt-key-gpghome.jsgicUam6M/gpg.1.sh --recv-keys --keyserver hkp: //keyserver.ubuntu.com: 80 0xF1656F24C74CD1D8
gpg: "//keyserver.ubuntu.com:" not a key ID: skipping
gpg: "80" not a key ID: skipping
gpg: keyserver receive failed: Invalid URI

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root@inventory-server:~# apt-key adv --recv-keys --keyserver hkp: //keyserver.ubuntu.com: 80 0xF1656F24C74CD1D8
Executing: /tmp/apt-key-gpghome.jsgicUam6M/gpg.1.sh --recv-keys --keyserver hkp: //keyserver.ubuntu.com: 80 0xF1656F24C74CD1D8
gpg: "//keyserver.ubuntu.com:" not a key ID: skipping
gpg: "80" not a key ID: skipping
gpg: keyserver receive failed: Invalid URI

Hola @DeadShot (https://underc0de.org/foro/index.php?action=profile;u=91548)

Si te fijas bien estas dejando 2 espacios que no van, la siguiente línea es la correcta según su página oficial (https://mariadb.com/kb/en/library/gpg/):

sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xF1656F24C74CD1D8

Saludos!
K A I L