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I cannot login to Alfresco Community Share (http://127.0.0.1:8080/share/page/?error=true) : I do not know the login I am suppoed to type in. It is not the one for Alfresco Community
Moderation note: I moved this thread to a space where people who can help might see it.
During a standard installation, you should have been prompted to create a password for the admin user. People often use "admin" there.
If that password is not working, there is a good chance that the content repository that runs behind Share did not properly start up.
In order to get help, you need to provide more information.