Apt Certificate verification failed on Ubuntu 18.04

Guntur WK

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Nov 7, 2021, 10:21:42 PM11/7/21

to Fluent Bit

Dear fluentBit member,

I try to install fluentbit on my machine following this step
https://docs.fluentbit.io/manual/installation/linux/ubuntu

I already add Server GPG key and update my sources lists.

But i got error when running

$ apt-get update

" Error:

Err:4 https://packages.fluentbit.io/ubuntu/bionic bionic Release

Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 139.178.85.103 443]

Hit:5 http://archive.ubuntu.com/ubuntu bionic-updates InRelease

Can somebody help me please?

Regards,

Frank Liu

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Nov 8, 2021, 12:52:45 AM11/8/21

to Guntur WK, Fluent Bit

You need to remove the expired DST Root CA X3 from the ca-certificates as discussed here:

https://serverfault.com/questions/1079199/client-on-debian-9-erroneously-reports-expired-certificate-for-letsencrypt-issue

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Guntur WK

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Nov 8, 2021, 2:35:14 AM11/8/21

to Fluent Bit

Thnk u gfrankliu,

That solve my problem.

Regards,

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