apt-get update: Err https://mirror.umd.edu -> server certificate verification failed

Today I tried executed the command: apt-get update. But there seems to be a problem, because I get error-messages like these:

Err trusty/main Sources server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
Err trusty/restricted Sources server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
etc. And then:
W: Failed to fetch server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
W: Failed to fetch server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none

etc.

I guess this problem is because I don't have a file called 'ca-certificates.crt' in that folder. I looked also on another server with Ubuntu 14.04 on it, but this certicate file doesn't excist there either. So, where can I find/download this crt-file?

I hope someone can help me.

Thanks, Kevin

1 Answer

Their certificate is invalid as of the other day - they forgot to renew their SSL Certificate

Simply visiting the URL with Firefox and checking the certificate warning shows you this.

mirror.umd.edu uses an invalid security certificate.

The certificate expired on 19/04/17 13:00.

The current time is 21/04/17 14:31.

You can either

• wait a bit
• Change repository
• Change the URLs in your apt sources to http:// (safe enough fi GPG signing is performed)
• Set Verify-Peer in your apt.conf settings to false (not recommended as a set-and-forget solution)

2

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