Packages authentication error. GPG error google-chrome-stable

Travis build fail.
OS - Ubuntu Trusty Tahr

log:

Adding APT Sources
1.33s$ sudo -E apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
gpg: keyring `/tmp/tmp61coc1rv/secring.gpg' created
gpg: keyring `/tmp/tmp61coc1rv/pubring.gpg' created
gpg: requesting key BA9EF27F from hkp server keyserver.ubuntu.com
gpg: /tmp/tmp61coc1rv/trustdb.gpg: trustdb created
gpg: key BA9EF27F: public key "Launchpad Toolchain builds" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
OK
9.34s$ travis_apt_get_update
Installing APT Packages
0.67s$ sudo -E apt-get -yq --no-install-suggests --no-install-recommends $(travis_apt_get_options) install google-chrome-stable g++-4.8
Reading package lists...
Building dependency tree...
Reading state information...
The following packages were automatically installed and are no longer required:
  libappindicator1 libdbusmenu-gtk4 libindicator7
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  cpp-4.8 gcc-4.8 gcc-4.8-base gcc-9-base libasan0 libatomic1 libgcc-4.8-dev
  libgomp1 libisl15 libitm1 libmpfr4 libquadmath0 libstdc++-4.8-dev libstdc++6
  libtsan0
Suggested packages:
  gcc-4.8-locales g++-4.8-multilib gcc-4.8-doc libstdc++6-4.8-dbg
  gcc-4.8-multilib libgcc1-dbg libgomp1-dbg libitm1-dbg libatomic1-dbg
  libasan0-dbg libtsan0-dbg libquadmath0-dbg libstdc++-4.8-doc
Recommended packages:
  libu2f-udev
The following NEW packages will be installed:
  gcc-9-base libisl15
The following packages will be upgraded:
  cpp-4.8 g++-4.8 gcc-4.8 gcc-4.8-base google-chrome-stable libasan0
  libatomic1 libgcc-4.8-dev libgomp1 libitm1 libmpfr4 libquadmath0
  libstdc++-4.8-dev libstdc++6 libtsan0
15 upgraded, 2 newly installed, 0 to remove and 293 not upgraded.
Need to get 94.5 MB of archives.
After this operation, 40.0 MB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  google-chrome-stable
E: There were unauthenticated packages and -y was used without --allow-unauthenticated
apt-get.diagnostics
apt-get install failed
The command "sudo -E apt-get -yq --no-install-suggests --no-install-recommends $(travis_apt_get_options) install google-chrome-stable g++-4.8" failed and exited with 100 during .
Your build has been stopped.
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