no public key available for 1397BC53640DB551

[psl]

Lubuntu 16.04, i386

# apt-get install pepperflashplugin-nonfree
...
Setting up pepperflashplugin-nonfree (1.8.2ubuntu1) ...
WARNING: W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
W: There is no public key available for the following key IDs:
1397BC53640DB551
E: No packages found
E: No packages found
E: No packages found
E: No packages found
E: No packages found
E: No packages found
dpkg-deb: error: --extract needs a target directory.
Perhaps you should be using dpkg --install ?

Type dpkg-deb --help for help about manipulating *.deb files;
Type dpkg --help for help about installing and deinstalling packages.
Processing triggers for libc-bin (2.23-0ubuntu3) ...

[psl (slansky)]

# update-pepperflashplugin-nonfree --status
WARNING: W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
W: There is no public key available for the following key IDs:
1397BC53640DB551
E: No packages found
E: No packages found
E: No packages found
E: No packages found
E: No packages found
E: No packages found
Flash Player version installed on this system :
Flash Player version available on upstream site: 20.0.0.306

[psl (slansky)]

# update-pepperflashplugin-nonfree --install
WARNING: W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
W: There is no public key available for the following key IDs:
1397BC53640DB551
E: No packages found
E: No packages found
E: No packages found
E: No packages found
E: No packages found
E: No packages found
dpkg-deb: error: --extract needs a target directory.
Perhaps you should be using dpkg --install ?

Type dpkg-deb --help for help about manipulating *.deb files;
Type dpkg --help for help about installing and deinstalling packages.

[ayoli (ayolinux)]

same here (ubuntu 15.10) :
$ sudo update-pepperflashplugin-nonfree --install
Mot de passe [sudo] pour ayoli :
ERROR: failed to retrieve status information from google : W: Aucune clé publique n'est disponible pour la/les clé(s) suivante(s) :
1397BC53640DB551
More information might be available at:
  http://wiki.debian.org/PepperFlashPlayer

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[psl (slansky)]

I just found that package pepperflashplugin-nonfree is deprecated and Flash plugin can be installed in the different way

https://wiki.ubuntu.com/Chromium/Getting-Flash