Installing Kontact on CentOS7

If you search for “install kontact centos7”, you find the first link: https://www.kolabsys.com/installation-guide/kontact-centos.html Unfortunately, that does not work. Even if you add the Kolab 16 repository (wget https://obs.kolabsys.com/repositories/Kolab:/16/CentOS_7/Kolab:16.repo) so that libkolab etc can be installed, you still have conflicts because

Mono: problems with certificates for using nuget

I had problems installing nuget packages on CentOS 7 with the mono packages from my copr at https://copr.fedorainfracloud.org/coprs/tpokorra/mono/ I got this error when running nuget restore: WARNUNG: Error: TrustFailure (Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED)WARNUNG: Error: TrustFailure (Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED) The solution is