Gitlab-ctl reconfigure fails

Running handlers:
There was an error running gitlab-ctl reconfigure:

rails_migration[gitlab-rails] (gitlab::database_migrations line 51) had an error: Mixlib::ShellOut::ShellCommandFailed: bash[migrate gitlab-rails database] (/opt/gitlab/embedded/cookbooks/cache/cookbooks/gitlab/resources/rails_migration.rb line 16) had an error: Mixlib::ShellOut::ShellCommandFailed: Command execution failed. STDOUT/STDERR suppressed for sensitive resource

I’m trying to go from 14.5.2 → 14.6.0 → 14.7.0 → 14.8.0 → 14.9.0 → 14.9.4 → 14.10.0 → 14.10.3 → 15.0.0. Is this the correct upgrade sequence?
I got as far as 14.9.4, but the database migration fails going from 14.9.4 → 14.10.0.
I’m tempted to go back to the snap I had before starting, but that’s really tedious.
I’d rather try to fix it at this point.