[pkg-gnupg-maint] Bug#914728: gpg: signing failed: No data callback in IPC

[Alexander William Wong]

Package: gnupg
Version: 2.2.11-1
Severity: important

Dear Maintainer,

I cannot sign data using my gpg key. I'm not sure how to proceed with
diagnosing this error.

```
$ echo "test" | gpg --verbose --clearsign
gpg: using pgp trust model
gpg: using subkey E90E5D6448C2C663 instead of primary key 0F8D1FA50FC4B4EE
gpg: writing to stdout
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

test
gpg: pinentry launched (5910 gnome3 1.1.0 /dev/pts/0 xterm-256color :0)
gpg: signing failed: No data callback in IPC
gpg: [stdin]: clear-sign failed: No data callback in IPC

```

I have set my GPG_TTY environment variable: `export GPG_TTY=$(tty)`


-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.18.0-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8), LANGUAGE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gnupg depends on:
ii  dirmngr         2.2.11-1
ii  gnupg-l10n      2.2.11-1
ii  gnupg-utils     2.2.11-1
ii  gpg             2.2.11-1
ii  gpg-agent       2.2.11-1
ii  gpg-wks-client  2.2.11-1
ii  gpg-wks-server  2.2.11-1
ii  gpgsm           2.2.11-1
ii  gpgv            2.2.11-1

gnupg recommends no packages.

Versions of packages gnupg suggests:
pn  parcimonie  <none>
pn  xloadimage  <none>

-- no debconf information