Problem:
sudo apt-key adv --fetch-keys 'https://mariadb.org/mariadb_release_signing_key.asc'
Executing: /tmp/tmp.o2I4wt3O3r/gpg.1.sh --fetch-keys
https://mariadb.org/mariadb_release_signing_key.asc
gpgkeys: protocol `https' not supported
gpg: no handler for keyserver scheme `https'
gpg: WARNING: unable to fetch URI https://mariadb.org/mariadb_release_signing_key.asc: keyserver error
Method 1: Install gnupg-curl
apt-get update
apt-get install gnupg-curl
Method 2: If the above does not resolve the issue, then get the key using CURL and add it manually
curl 'https://mariadb.org/mariadb_release_signing_key.asc' | apt-key add -
Method 3: If you trust the server, then use -k option to skip CA cert verification
curl -k 'https://mariadb.org/mariadb_release_signing_key.asc' | apt-key add -
The method 2 worked for me on Ubuntu Xenial.
Comment if it helped you or if you are aware of a better solution.
Thanks.
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