Hello,
What was the resolution on this one? We have another post with a similar error. Upgrade from Foreman 2.0.2 / Katello 3.15 to Foreman 2.1.2 / Katello 3.16 fails
[DEBUG 2020-08-12T14:53:48 main] Executing: foreman-maintain packages is-locked --assumeyes
[DEBUG 2020-08-12T14:53:50 main] Packages are not locked
[ERROR 2020-08-12T14:53:50 main] foreman-maintain packages is-locked --assumeyes failed! Check the output for error!
[DEBUG 2020-08-12T14:53:50 main] Hook /usr/share/foreman-installer/katello/hooks/pre_commit/09-version_locking.rb returned nil
[DEBUG 2020-08-12T14:53:51 main] Hook /usr/share/foreman-installer/katello/hooks/pre_commit/13-hiera.rb returned nil
[DEBUG 2020-08-12T14:53:51 main] Hook /usr/share/foreman-installer/katello/hooks/pre_commit/14-cdn_setting.rb returned nil
[ INFO 2020-08-12T14:53:51 main] All hooks in group pre_commit finished