Ethereum Cert-issuer installation error



I’m trying to install cert-issuer on a fresh installation of Ubuntu 18.04.1
So i run the command “python3 experimental --blockchain=ethereum” and the installation stopped with an error same as the below picture but with coincurve instead of requests[security].

Then i immediately run the same command again and get a different error this time (see below picture)

Re-running the command i am stuck at the same error. I tried running “python3 -m pip install requests[security]>=2.18.4” but i get a “segmentation fault (core dumped)” error. What could be the case?

Any help is much appreciated.


Are you running this in virtualenv?