A ca-certificates update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, and 21.10.

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Ubuntu Security Notice USN-5473-1
June 08, 2022

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

- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

The CA certificates in the ca-certificates package were updated.

Software Description:
- ca-certificates: Common CA certificates

Details:

The ca-certificates package contained outdated CA certificates. This update
refreshes the included certificates to those contained in the 2.50 version
of the Mozilla certificate authority bundle.

Update instructions:

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

Ubuntu 21.10:
ca-certificates 20211016~21.10.1

Ubuntu 20.04 LTS:
ca-certificates 20211016~20.04.1

Ubuntu 18.04 LTS:
ca-certificates 20211016~18.04.1

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

References:
  https://ubuntu.com/security/notices/USN-5473-1
  https://launchpad.net/bugs/1976631

Package Information:
  https://launchpad.net/ubuntu/+source/ca-certificates/20211016~21.10.1
  https://launchpad.net/ubuntu/+source/ca-certificates/20211016~20.04.1
  https://launchpad.net/ubuntu/+source/ca-certificates/20211016~18.04.1