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Here is the result when I use the command sudo apt-get update:

Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Get:2 http://dl.openfoam.org/ubuntu focal InRelease [6353 B]
Get:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:4 http://archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Get:5 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Err:2 http://dl.openfoam.org/ubuntu focal InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6C0DAC728B29D817
Reading package lists... Done
W: GPG error: http://dl.openfoam.org/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6C0DAC728B29D817
E: The repository 'http://dl.openfoam.org/ubuntu focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

I don't know how to fix this.

Nmath
  • 12,664
William Villacis
  • 9

1 Answers1

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Make sure you have followed all the instructions here:

  1. Copy and paste the following in a terminal prompt (Applications → Accessories → Terminal) to add dl.openfoam.org to the list of software repositories for apt to search, and to add the public key (gpg.key) for the repository to enable package signatures to be verified. Note: use secure https:// for the public key to ensure secure transfer, but usehttp:// for the repository, since https:// may not be supported and is not required since the key provides secure authentication of the package files.

sudo sh -c "wget -O - https://dl.openfoam.org/gpg.key | apt-key add -"
sudo add-apt-repository http://dl.openfoam.org/ubuntu

  1. Update the apt package list to account for the new download repository location

sudo apt-get update

  1. Install OpenFOAM (9 in the name refers to version 9) which also installs paraviewopenfoam56 as a dependency.

sudo apt-get -y install openfoam9

Especially the first step, which adds the GPG key, which you seem to be missing.

martibs
  • 63