[Opm] "Failed to add key" error when trying install OPM on Ubuntu 16.04

[bacetti abdelmoumen]

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 at 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 at ubuntu:~*$ apt-cache search opm-simulators
(nothing)




Regards/Cordialement

Abdelmoumen Bacetti

abdelmoumen.bacetti at sonatrach.dz
bacetti.abdelmoumen at gmail.com
Linkedin <https://www.linkedin.com/in/abdelmoumen-bacetti-01a46b138/>
&    Researchgate
<https://www.researchgate.net/profile/Abdelmoumen_Bacetti2>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <//opm-project.org/pipermail/opm/attachments/20180428/fe74eedc/attachment.html>