Merge release branch 4.20 to main

* 4.20:
  Fix configure package repo link (#531)
  revert removal of ubunut EOL version (#522)
  Remove EOL Ubuntu version (#521)
  Update 4.20.1 release notes (#520)
  Revert "notes on guest os category changes and modern image selection (#500)" (#518)
  notes on guest os category changes and modern image selection (#500)

Author: Daan Hoogland

source/installguide/optional_installation.rst

@@ -48,7 +48,7 @@ Steps to Install the Usage Server
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 #. Package repository should already being configured. Refer to 
-   `Configure Package Repository <http://cloudstack-installation.readthedocs.org/en/latest/installation.html#configure-package-repository>`_
+   `Configure Package Repository <../installguide/management-server/_pkg_repo.html#configure-package-repository>`_
 
 #. Install package cloudstack-usage
 

source/releasenotes/compat.rst

@@ -50,6 +50,7 @@ and VMware with vSphere.
 -  Alma Linux 8, 9 with KVM
 -  Rocky Linux 8, 9 with KVM
 -  Red Hat Enterprise Linux 8, 9 with KVM
+-  Experimental support for Red Hat Enterprise Linux 10 with KVM
 -  openSUSE Leap 15 with KVM
 -  SUSE Linux Enterprise Server 15 with KVM
 -  XCP-ng 8.2.0