How do I build this on my own computer?

[pitosalas]

Sorry for the trivial question... When I try to build this (on MacOS), I get an error that seems like it should not be there. I would appreciate it if you could help me understand:

docker build .
Sending build context to Docker daemon  84.99kB
Step 1/17 : FROM dorowu/ubuntu-desktop-lxde-vnc
 ---> 68b31e964e2f
Step 2/17 : LABEL maintainer "bpinaya@wpi.edu"
 ---> Using cache
 ---> fc318c59a9cb
Step 3/17 : RUN sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
 ---> Using cache
 ---> 4c5834d16ba5
Step 4/17 : RUN apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116
 ---> Running in 508312d8a3a4
Warning: apt-key output should not be parsed (stdout is not a terminal)
Executing: /tmp/apt-key-gpghome.HfFs84vHCx/gpg.1.sh --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116
gpg: failed to start the dirmngr '/usr/bin/dirmngr': No such file or directory
gpg: connecting dirmngr at '/tmp/apt-key-gpghome.HfFs84vHCx/S.dirmngr' failed: No such file or directory
gpg: keyserver receive failed: No dirmngr
The command '/bin/sh -c apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116' returned a non-zero code: 2
~/m/rosdocker (master *☡=)

[bpinaya]

Hey there! It seems to be an issue with this line:

RUN apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116

That one is for installing ROS. Give me a couple days and I'll update you with more details. Thanks for pointing it out, I never tried this on Mac.
Can you give me your docker --version ?

[bpinaya]

Seems to be a proxy error, do you have a firewall set up or something?
Check:

• https://unix.stackexchange.com/questions/75892/keyserver-timed-out-when-trying-to-add-a-gpg-public-key
• Error on apt-key balena-io/etcher#859
• https://answers.ros.org/question/307081/unable-to-install-keys-for-ros-kinetic-using-ubuntu-1604/
  I'll test on a different machine but I tested it on a linux install and it works ok. I'm assuming there is issues with your connection.

[ozangungor12]

Hey! I had the same problem while building this image on my computer and the problem is that dirmngr is not installed.

gpg: keyserver receive failed: No dirmngr

I solved it by adding the following line to the beginning of the Dockerfile:

RUN apt-get install dirmngr -y

If it complains that package is not available, just run apt-get update before the command and it should fix it.