An Apache HTTP Server update has been released for Ubuntu Linux 18.04 LTS to enable TLSv1.3 support.

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Ubuntu Security Notice USN-4307-1
March 18, 2020

apache2 update
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

TLSv1.3 support has been enabled in Apache HTTP Server in Ubuntu 18.04 LTS.

Software Description:
- apache2: Apache HTTP server

Details:

As a security improvement, this update adds TLSv1.3 support to the Apache
HTTP Server package in Ubuntu 18.04 LTS.

TLSv1.3 is enabled by default, and in certain environments may cause
compatibility issues. The SSLProtocol directive may be used to disable
TLSv1.3 in these problematic environments.

Update instructions:

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

Ubuntu 18.04 LTS:
apache2-bin 2.4.29-1ubuntu4.13

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

References:
https://usn.ubuntu.com/4307-1
https://launchpad.net/bugs/1845263

Package Information:
https://launchpad.net/ubuntu/+source/apache2/2.4.29-1ubuntu4.13