For people experiencing this bug if the duplicate certificate is Go_Daddy_Class_2_CA.pem provided by python-ubuntu-sso-client you can resolve this by purging the package e.g.
"sudo apt-get purge python-ubuntu-sso-client"
For people experiencing this bug if the duplicate certificate is Go_Daddy_ Class_2_ CA.pem provided by python- ubuntu- sso-client you can resolve this by purging the package e.g.
"sudo apt-get purge python- ubuntu- sso-client"