Verified in 6.12.3 snap 2.0 (with rubygem-katello-4.5.0.31-1.el8sat.noarch): Steps: 1) Set pagination that registered hosts were split between more pages: Administer -> Settings -> Entries per page = 3 2) Synced RHEL8 BaseOS, created AK and registered 4 RHEL8 content hosts and few others. 3) Followed steps from Comment#0. 4) Also tried to install Errata via WebUI > Content > Errata > pick errata > select all hosts Results: 1) Clicking on "Select all X" text selected the host on next page too. 2) "Oops" error was not shown. 3) Package install/remove/update was successfully executed via REX against all selected hosts. 4) Errata installation was successfully executed via REX against all selected hosts.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Important: Satellite 6.12.3 Async Security Update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2023:1630