I’m trying to follow the installation instructions for Debian provided on Docker website. Unfortunately adding a GPG key fails for me:

$ curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
gpg: WARNING: nothing exported
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

I’ve tried to download the key and add it from the local file system, but the effect is the same:

$ apt-key add docker.gpg 
gpg: WARNING: nothing exported
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

The same happens for other keys, e.g. VirtualBox:

$ apt-key add oracle_vbox_2016.asc 
gpg: WARNING: nothing exported
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

The keys looks fine:

$ cat docker.gpg 

-----BEGIN PGP PUBLIC KEY BLOCK-----

mQINBFit2ioBEADhWpZ8/wvZ6hUTiXOwQHXMAlaFHcPH9hAtr4F1y2+OYdbtMuth
lqqwp028AqyY+PRfVMtSYMbjuQuu5byyKR01BbqYhuS3jtqQmljZ/bJvXqnmiVXh
[...]
jCxcpDzNmXpWQHEtHU7649OXHP7UeNST1mCUCH5qdank0V1iejF6/CfTFU4MfcrG
YT90qFF93M3v01BbxP+EIY2/9tiIPbrd
=0YYhg
-----END PGP PUBLIC KEY BLOCK-----

$ shasum docker.gpg 
f5b5bd1487cefc0c53c947e11ca202e86b33dbad  docker.gpg

$ gpg --list-packets docker.gpg 
# off=0 ctb=99 tag=6 hlen=3 plen=525
:public key packet:
    version 4, algo 1, created 1487788586, expires 0
    pkey[0]: [4096 bits]
    pkey[1]: [17 bits]
    keyid: 8D81803C0EBFCD88
# off=528 ctb=b4 tag=13 hlen=2 plen=43
:user ID packet: "Docker Release (CE deb) <[email protected]>"
# off=573 ctb=89 tag=2 hlen=3 plen=567
:signature packet: algo 1, keyid 8D81803C0EBFCD88
    version 4, created 1487792064, md5len 0, sigclass 0x13
    digest algo 10, begin of digest b2 c9
    hashed subpkt 2 len 4 (sig created 2017-02-22)
    hashed subpkt 27 len 1 (key flags: 2F)
    hashed subpkt 11 len 4 (pref-sym-algos: 9 8 7 3)
    hashed subpkt 21 len 4 (pref-hash-algos: 10 9 8 11)
    hashed subpkt 22 len 4 (pref-zip-algos: 2 3 1 0)
    hashed subpkt 30 len 1 (features: 01)
    hashed subpkt 23 len 1 (keyserver preferences: 80)
    subpkt 16 len 8 (issuer key ID 8D81803C0EBFCD88)
    data: [4094 bits]
# off=1143 ctb=b9 tag=14 hlen=3 plen=525
:public sub key packet:
    version 4, algo 1, created 1487788586, expires 0
    pkey[0]: [4096 bits]
    pkey[1]: [17 bits]
    keyid: 7EA0A9C3F273FCD8
# off=1671 ctb=89 tag=2 hlen=3 plen=1086
:signature packet: algo 1, keyid 8D81803C0EBFCD88
    version 4, created 1487788586, md5len 0, sigclass 0x18
    digest algo 8, begin of digest f2 b8
    hashed subpkt 2 len 4 (sig created 2017-02-22)
    hashed subpkt 27 len 1 (key flags: 02)
    subpkt 16 len 8 (issuer key ID 8D81803C0EBFCD88)
    subpkt 32 len 540 (signature: v4, class 0x19, algo 1, digest algo 8)
    data: [4095 bits]

Am I doing something wrong? What steps should I take to troubleshoot it further?

I’m on Debian Stretch. I don’t have any firewall. I’ve tried it on several networks.

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