It was running and I can no longer access it using localhost:9000, after a restart.
I got this in the error log:
2023.08.30 04:57:23 WARN app[][o.s.a.p.AbstractManagedProcess] Process exited with exit value [ElasticSearch]: 78
2023.08.30 04:57:23 INFO app[][o.s.a.SchedulerImpl] Process[ElasticSearch] is stopped
2023.08.30 04:57:23 INFO app[][o.s.a.SchedulerImpl] SonarQube is stopped
2023.08.30 05:01:05 INFO app[][o.s.a.AppFileSystem] Cleaning or creating temp directory /opt/sonarqube/temp
2023.08.30 05:01:05 INFO app[][o.s.a.es.EsSettings] Elasticsearch listening on [HTTP: 127.0.0.1:9001, TCP: 127.0.0.1:35339]
2023.08.30 05:01:05 INFO app[][o.s.a.ProcessLauncherImpl] Launch process[ELASTICSEARCH] from [/opt/sonarqube/elasticsearch]: /opt/sonarqube/elasticsearch/bin/elasticsearch
2023.08.30 05:01:06 INFO app[][o.s.a.SchedulerImpl] Waiting for Elasticsearch to be up and running
2023.08.30 05:01:28 WARN app[][o.s.a.p.AbstractManagedProcess] Process exited with exit value [ElasticSearch]: 78
2023.08.30 05:01:28 INFO app[][o.s.a.SchedulerImpl] Process[ElasticSearch] is stopped
2023.08.30 05:01:28 INFO app[][o.s.a.SchedulerImpl] SonarQube is stopped
sonar@ubuntu-virtual-machine:~/bin/linux-x86-64$