Node install error about canvas-docker

[jrichardsz]

I have the same error:

reading package lists...
W: GPG error: https://deb.nodesource.com trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1655A0AB68576280
Reading package lists...
Building dependency tree...
Reading state information...
fontforge is already the newest version.
unzip is already the newest version.
The following NEW packages will be installed:
  nodejs yarn
0 upgraded, 2 newly installed, 0 to remove and 1 not upgraded.
Need to get 11.7 MB of archives.
After this operation, 54.8 MB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  nodejs
E: There are problems and -y was used without --force-yes
The command '/bin/sh -c curl -sL https://deb.nodesource.com/setup_6.x | bash     && curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -     && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list     && apt-get update     && apt-get install -y --no-install-recommends         nodejs         yarn="$YARN_VERSION"         unzip         fontforge' returned a non-zero code: 100

• os: ubuntu 18
• command: docker build -t canvas-docker .