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Ubuntu Security Notice USN-5089-2
September 23, 2021

ca-certificates update
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

A certificate about to expire was removed from ca-certificates.

Software Description:
- ca-certificates: Common CA certificates

Details:

USN-5089-1 updated ca-certificates. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

 The ca-certificates package contained a CA certificate that will expire on
 2021-09-30 and will cause connectivity issues. This update removes the
 “DST Root CA X3” CA.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 ESM:
  ca-certificates                 20210119~16.04.1ubuntu0.1~esm1

Ubuntu 14.04 ESM:
  ca-certificates                 20190110~14.04.1~esm2

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5089-2
  https://ubuntu.com/security/notices/USN-5089-1
  https://launchpad.net/bugs/XXXXXX