OpenMediaVault default password is printed in the documentation. I did not see it the first time I installed it either. So I had to do some detective work my self to find it.
OpenMediaVault default password
For the Admin panel
Username: admin
Password: openmediavault
SSH/Root
Username: root
Password: (You selected your own root password during installation)
Some useful links
How to change the admin password.
How to set a new root password if you have lost your root password. Only for Debian based installations.
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