Hi,
I get this error for 'sfdx force:org:list` or for any 'sfdx` command. I re-installed node, npm and sfdx cli without luck. My workaround is `export NODE_TLS_REJECT_UNAUTHORIZED=0` that is not ideal. Any suggestion?

Also `npm config ls -l` lists `cafile = "/etc/ssl/certs/xxxxxCA.pem` that does exist. 

Error: self signed certificate in certificate chain
    at TLSSocket.onConnectSecure (_tls_wrap.js:1497:34)
    at TLSSocket.emit (events.js:315:20)
    at TLSSocket._finishInit (_tls_wrap.js:932:8)
    at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:706:12) {
  code: 'SELF_SIGNED_CERT_IN_CHAIN'
}