Add CA root certificate in Linux 3. December 2019 Daniƫl (0) curl https://geotrust.tbs-certificats.com/GeoTrust_RSA_CA_2018.crt -o GeoTrustRSACA2018.crtsudo cp GeoTrustRSACA2018.crt /usr/local/share/ca-certificates/GeoTrustRSACA2018.crtsudo update-ca-certificates