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Go to Applications and open Terminal.
Install mdadm with the following commands.
Ubuntu@ubuntu:~$ sudo -i
root@ubuntu:~$ apt-get install mdadm
Select No configuration and complete the installation.
Install lvm2 with the following commands.
root@ubuntu:~$ apt-get install lvm2 (otherwise vgchange won’t work)
Run the following command to mount all of the hard drives from your DiskStation.
root@ubuntu:~$ mdadm -Asf && vgchange -ay