↓を実行して
sudo gitlab-ctl start
↓のエラーが出た場合は
fail: alertmanager: runsv not running
fail: gitaly: runsv not running
fail: gitlab-exporter: runsv not running
fail: gitlab-workhorse: runsv not running
fail: grafana: runsv not running
fail: logrotate: runsv not running
fail: nginx: runsv not running
fail: node-exporter: runsv not running
fail: postgres-exporter: runsv not running
fail: postgresql: runsv not running
fail: prometheus: runsv not running
fail: puma: runsv not running
fail: redis: runsv not running
fail: redis-exporter: runsv not running
fail: sidekiq: runsv not running
↓で直るかもしれません。
sudo /opt/gitlab/embedded/bin/runsvdir-start
環境：
| Ubuntu | 18.04.5 LTS (Bionic Beaver) |
| gitlab-cli | 1:1.3.0-2 |
| GitLab Community Edition | 13.0.5 |