Good morning While trying to install OPM on Ubuntu 16.04 LTS, I got this output, and no package added. I did the update and install software-properties-common. What's the problem ??
*ubuntu@ubuntu:~*$ sudo apt-add-repository ppa:opm/ppa The Open Porous Media (OPM) initiative provides a set of open-source tools centered around the simulation of flow and transport of fluids in porous media. The goal of the initiative is to establish a sustainable environment for the development of an efficient and well-maintained software suite. More info: https://launchpad.net/~opm/+archive/ubuntu/ppa Press [ENTER] to continue or ctrl-c to cancel adding it gpg: keyring `/tmp/tmpl_ggfvn9/secring.gpg' created gpg: keyring `/tmp/tmpl_ggfvn9/pubring.gpg' created gpg: requesting key 072EF342 from hkp server keyserver.ubuntu.com gpgkeys: key A754739BF0A72DEA5125B57E5426DBEF072EF342 can't be retrieved gpg: no valid OpenPGP data found. gpg: Total number processed: 0 gpg: keyserver communications error: keyserver helper general error gpg: keyserver communications error: unknown pubkey algorithm gpg: keyserver receive failed: unknown pubkey algorithm Failed to add key. *ubuntu@ubuntu:~*$ apt-cache search opm-simulators (nothing) Regards/Cordialement Abdelmoumen Bacetti abdelmoumen.bace...@sonatrach.dz bacetti.abdelmou...@gmail.com Linkedin <https://www.linkedin.com/in/abdelmoumen-bacetti-01a46b138/> & Researchgate <https://www.researchgate.net/profile/Abdelmoumen_Bacetti2>
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