I have been trying to install opencoarrays from here, using the commands:

sudo apt-get update -y
sudo apt-get install -y open-coarrays-bin

It seems that every other Ubuntu version, this works fine. As mentioned in the question title, I am running Ubuntu 20.04, which seems to be an issue for this package, as it is not there. Running the above code gives:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package open-coarrays-bin

Does anyone know how to install OpenCoarrays on Ubuntu 20.04?

1 Answer 1


Normal native method of installation is possible by using different package names:

sudo apt-get install libcaf-openmpi-3 libcaf-mpich-3

The mentioned open-coarrays-bin package is available only for Ubuntu 18.04 LTS, so you can download and install it manually:

cd ~/Downloads
wget http://archive.ubuntu.com/ubuntu/pool/universe/h/hwloc/libhwloc5_1.11.9-1_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/universe/o/openmpi/libopenmpi2_2.1.1-8_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/universe/o/open-coarrays/libcaf-mpi2_2.0.0~rc1-2_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/universe/o/open-coarrays/open-coarrays-bin_2.0.0~rc1-2_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/universe/o/open-coarrays/libcoarrays-dev_2.0.0~rc1-2_amd64.deb

sudo apt-get install ./libhwloc5_1.11.9-1_amd64.deb ./libopenmpi2_2.1.1-8_amd64.deb ./libcaf-mpi2_2.0.0~rc1-2_amd64.deb ./open-coarrays-bin_2.0.0~rc1-2_amd64.deb ./libcoarrays-dev_2.0.0~rc1-2_amd64.deb

and then use it as it was planned.

  • thank you for your answer. Using your second suggestion, I do indeed now have coarrays installed, but when I try to compile code, for instance caf test_coarray.f95 -o testcoarray, I get the error: gfortran: error: /usr/lib/x86_64-linux-gnu/libcaf_mpi.a: No such file or directory Error: comand: /usr/bin/mpifort -I/usr/include/OpenCoarrays-2.0.0-rc1_GNU-7.3.0 -fcoarray=lib test_coarray.f95 -o testcoarray /usr/lib/x86_64-linux-gnu/libcaf_mpi.a failed to compile. Commented Sep 27, 2020 at 2:26
  • 1
    I have added the libcoarrays-dev package to get a-library installed.
    – N0rbert
    Commented Sep 27, 2020 at 8:14
  • mate, you are a legend. I have compiled coarray code that now runs. My only issue is a message that pops up at the start every run, Invalid MIT-MAGIC-COOKIE-1. You wouldn't know what this is or how to solve it? Commented Sep 27, 2020 at 13:33
  • I'm not sure, but it may be caused by running the applications as root (or sudo'er). Try to launch your application as regular user.
    – N0rbert
    Commented Sep 27, 2020 at 13:40
  • 1
    Looks as warning, you can ignore it if it does not break compilation, then simply ignore it :)
    – N0rbert
    Commented Sep 27, 2020 at 13:48

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