Merge pull request travis-ci#3371 from travis-ci/michal-at-travisci-trusty-xenial

Trusty and Xenial deprecation notes

Author: nrios14

user/reference/bionic.md

@@ -3,6 +3,8 @@ title: The Ubuntu 18.04 Build Environment
 layout: en
 ---
 
+> Bionic LTS Standard is EOL by Canonical, try updating to a newer image. It will be in use in Travis CI for some time more, but it's time to consider migration of your builds to a newer build environment image.
+
 ## What This Guide Covers
 
 This guide provides an overview of the packages, tools and settings available in the Bionic environment.

user/reference/linux.md

@@ -9,12 +9,12 @@ layout: en
 This page gives an overview of the different Ubuntu Linux distributions you can use as your CI environment.
 
 You can choose one of the following distributions:
-* [Ubuntu Jammy 22.04](/user/reference/jammy/)
-* [Ubuntu Focal 20.04](/user/reference/focal/)
-* [Ubuntu Bionic 18.04](/user/reference/bionic/)
-* [Ubuntu Xenial 16.04](/user/reference/xenial/) **default**
-* [Ubuntu Trusty 14.04](/user/reference/trusty/) 
-* [Ubuntu Precise 12.04](/user/reference/precise/)
+* [Ubuntu Jammy 22.04](/user/reference/jammy/)  **recommended**
+* [Ubuntu Focal 20.04](/user/reference/focal/)  **recommended**
+* [Ubuntu Bionic 18.04](/user/reference/bionic/) *deprecation warning, will be available for some time more*
+* [Ubuntu Xenial 16.04](/user/reference/xenial/) **default** *deprecation warning: by end of 2024*
+* [Ubuntu Trusty 14.04](/user/reference/trusty/) *deprecation warning: by end of 2024*
+* [Ubuntu Precise 12.04](/user/reference/precise/) *deprecated*
 
 ## Using Ubuntu Linux distributions
 

user/reference/precise.md

@@ -7,7 +7,8 @@ redirect_from:
   - /user/workers/standard-infrastructure/
 ---
 
-> Precise is EOL by Canonical, try updating to a newer image and see our [Precise to Trusty Migration Guide](/user/precise-to-trusty-migration-guide) and [Trusty to Xenial Migration Guide](/user/trusty-to-xenial-migration-guide).
+> Precise is EOL by Canonical, try updating to a newer image. It is considered as deprecated build envrionment in Travis CI and not supportted with any updates.
+> Past guides, for reference: [Precise to Trusty Migration Guide](/user/precise-to-trusty-migration-guide) and [Trusty to Xenial Migration Guide](/user/trusty-to-xenial-migration-guide).
 
 ### What This Guide Covers
 

user/reference/trusty.md

@@ -6,7 +6,8 @@ redirect_from:
   - /user/workers/standard-infrastructure/
 ---
 
-> Trusty is EOL by Canonical, try updating to a newer image and see our [Trusty to Xenial Migration Guide](/user/trusty-to-xenial-migration-guide).
+> Trusty is EOL by Canonical, try updating to a newer image. All work in Travis CI over updates to Trusty images is ceased with end of calendar year 2024 and we consider it being deprecated.
+> You may see our [Trusty to Xenial Migration Guide](/user/trusty-to-xenial-migration-guide) as an interim step in update, yet please note Xenial LTS is also EOL already. More up to date image is strongly recommended.
 
 ## What This Guide Covers
 

user/reference/xenial.md

@@ -3,6 +3,8 @@ title: The Xenial Build Environment
 layout: en
 ---
 
+> Xenial LTS Standard is EOL by Canonical, try updating to a newer image. All work in Travis CI over updates to Xenial images is ceased with end of calendar year 2024 and we consider it being deprecated.
+
 ## What This Guide Covers
 
 This guide provides an overview of the packages, tools and settings available in the Xenial environment.