Empty keyring after upgrade to Ubuntu 18.04 :/

[Paul M Furley]

Hi folks,

I upgraded from Ubuntu 16.04 LTS to Ubuntu 18.04 LTS and restored my `.gnupg` directory from a backup disk.

Now gpg doesn't see any keys... `gpg --list-keys` just exists with no output.

I've attached the strace output of `strace gpg --list-keys`, and here's the output of `tree .gnupg/`:

```
/home/paul/.gnupg
├── crls.d
│   └── DIR.txt
├── gpg-agent.conf
├── gpg-agent-info-xps
├── gpg.conf
├── hkps.pool.sks-keyservers.net.pem
├── openpgp-revocs.d
│   └── [REDACTED x2].rev
├── private-keys-v1.d
│   └── [REDACTED x8].key
├── pubring.gpg
├── pubring.kbx
├── random_seed
├── S.dirmngr
├── secring.gpg
├── S.gpg-agent
├── sshcontrol
└── trustdb.gpg

3 directories, 23 files

```

Is there anything else I can provide to help debug this?

Thanks!

Paul

[unsigned... obviously ;) ]
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