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#5231 certificate of download.webmin.com has expired, https install on ubuntu/debian fails
Webmin cannot be installed using https on debian / ubuntu, as the certificate for download.webmin.com has expired:
download.webmin.com uses an invalid security certificate. The certificate expired on Friday, January 18, 2019, 06:07:30.
Please update the certificate. Consider using Letsencrypt, which has an automatic update mechanism, preventing this problem in the future.
Addition: it seems you are using Letsencrypt, maybe the update mechanism has failed?
I've temporarily removed the problem mirror from DNS until we get this fixed.