Updating Artifactory pro from 6.10.9 to 7.6.3 – Debian

We just update our artifactory 6.10.9 to 7.6.3 on Ubuntu using debian package.
The migration.log show that the migration complete successfully
the service start bu we get a 404 when accessing the server.
There is errors on router-service.log:

 [jfrou] [FATAL] [1ef8ac7a8bab9898] [bootstrap.go:93] [main] - Cluster join: Failed resolving join key: failed resolving 'shared.security.joinKey' key; file does not exist: /opt/jfrog/artifactory/var/etc/security/join.key

in frontend-service.log :

[jffe ] [ERROR] [    ] [    ] [main] - Error: connect ECONNREFUSED 127.0.0.1:8046
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1107:14)

in metadata-service.log :

[jffe ] [ERROR] [    ] [    ] [main] - Error: connect ECONNREFUSED 127.0.0.1:8046
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1107:14)

And this is the first errors in the console.log :

2020-08-18T19:27:12.494Z [jfrt ] [ERROR] [d2fc2e16d5fc1039] [actoryContextConfigListener:83] [ocalhost-startStop-1] - Failed initializing Artifactory context: Artifactory home not initialized.
2020-08-18T15:27:12.495L [tomct] [SEVERE] [                ] [org.apache.catalina.core.StandardContext] [org.apache.catalina.core.StandardContext startInternal] - One or more listeners failed to start. Full details will be found in the appropriate container log file
2020-08-18T15:27:12.497L [tomct] [SEVERE] [                ] [org.apache.catalina.core.StandardContext] [org.apache.catalina.core.StandardContext startInternal] - Context [/artifactory] startup failed due to previous errors

Does someone already had this kind of issue ? Thanks for clues.