Why is 14.04 (Trusty) no longer supported?#
On 14.04 (Trusty), the Ubuntu Pro Client package is not receiving upstream updates beyond version 19.6, plus any critical CVE maintenance related to this version.
Version 19.6 already has full-featured support of the applicable Ubuntu Pro
livepatch. In the event that a CVE is
discovered that affects the Ubuntu Pro Client version on Trusty, a fix and
backport will be provided for those specific issues.