Obtaining certificate chain for dash.staging.ubuntu.com, one moment while we download the dash.staging.ubuntu.com certificate and related intermediate certificates...
Refreshing certificate chain and revocation status for dash.staging.ubuntu.com, one moment while we re-check the dash.staging.ubuntu.com certificate and related intermediate certificates...
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Revocation check via OCSP and CRL for dash.staging.ubuntu.com failed
Sorry, the request for dash.staging.ubuntu.com could not be completed...
We could not load the certificate for dash.staging.ubuntu.com, it might not exist or we could not reach the server, complete the TLS handshake, etc.
Revoked certificates can't and should not be trusted, these certificate will cause errors like "NET::ERR_CERT_REVOKED" in browsers and expose a security risk.