fetch-crl binary package in Ubuntu Bionic amd64

 This tool and associated cron entry ensure that Certificate Revocation
 Lists (CRLs) are periodically retrieved from the web sites of the
 respective Certification Authorities.
 .
 The fetch-crl tool finds all *.crl_url files in the configured CRL
 directory, downloads the CRLs listed in those files and saves them in
 the same directory. The default configuration uses
 /etc/grid-security/certificates as the CRL directory.

Source package