gnucash finance::quote can't receive stock prices anymore

[ThomasRosenkranz]

since december 12th 2016 I can't receive stock informations via finance::quote (1.38) anymore to update my porfolio value. While trying to update the stock prices gnucash is in an endless loop waiting and ubuntu ask me to kill gnucash or wait as soon I click anywhere in the GUI.
Already updated Date::Manip and Finance::Quote via perl ... problem is still there.

Yahoo doesn't give any answer and there is no time out
$gnc-fq-dump yahoo BAESY.PK

wehre as finanzpartner gives some kind of feedback:
$gnc-fq-dump finanzpartner BAESY.PK
Finance::Quote fields Gnucash uses:
    symbol: BAESY.PK (deduced) <=== required
      date: ** missing ** <=== required
  currency: ** missing ** <=== required
      last: <=\
       nav: <=== one of these
     price: <=/
  timezone: <=== optional

** This stock quote cannot be used by gnucash!!

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnucash 1:2.6.12-1
ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
Uname: Linux 4.4.0-53-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
CurrentDesktop: GNOME
Date: Sun Dec 18 20:32:10 2016
InstallationDate: Installed on 2016-01-05 (348 days ago)
InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Release amd64 (20151021)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gnucash
UpgradeStatus: Upgraded to xenial on 2016-04-22 (240 days ago)

[Launchpad Janitor (janitor)]

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

[Ian Turner (vectro)]

Yahoo deco'd their quotes API last year. The recommendation is to move to Alphavantage as a source of quotes, which requires an API key. GnuCash 2.6.20 adds UI support to enter the API key, although there are workarounds available for the earlier versions that ship with Ubuntu.

https://wiki.gnucash.org/wiki/FAQ#Q:_Why_doesn.27t_online_quoting_work.3F