[pkg-gnupg-maint] Bug#911768: pinentry-gnome3 fails to open a window with 'No Gcr System Prompter available, falling back to curses'

[Tiziano Zito]

Package: pinentry-gnome3
Version: 1.1.0-1+b1
Severity: serious

Hi!

pinentry-gnome3 (but also pinentry-gtk-2) does not open a window anymore to ask for a passphrase. If run from terminal it shows:

No Gcr System Prompter available, falling back to curses
OK Pleased to meet you

It was working fine since years. Of the packages pinentry-gnome3 depends on, I have only upgraded recently libgpg-error0,  libncursesw6, libtinfo6.
Even downgrading libgpg-error0 to 1.32-1 does not fix the issue.

I am clueless, but willing to help to find the culprit...

Ciao!
Tiziano

PS: not sure it is relevant, but I am not running GNOME, I use fvwm instead. Dbus is running.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

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

Versions of packages pinentry-gnome3 depends on:
ii  gcr              3.28.0-1
ii  libassuan0       2.5.1-2
ii  libc6            2.27-6
ii  libgcr-base-3-1  3.28.0-1
ii  libglib2.0-0     2.58.1-2
ii  libgpg-error0    1.32-3
ii  libncursesw6     6.1+20181013-1
ii  libsecret-1-0    0.18.6-3
ii  libtinfo6        6.1+20181013-1

Versions of packages pinentry-gnome3 recommends:
pn  dbus-user-session  <none>

Versions of packages pinentry-gnome3 suggests:
ii  pinentry-doc  1.1.0-1

-- no debconf information