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Install Storage Device Manager if it has not been added.
- Go to Applications (or Main Menu) > Ubuntu Software Center.
- Enter pysdm in the Search Box.
- Select Storage Device Manager, click the "Install" button.
- Go to System > Administration > Storage Device Manager.
- Extend the list of sda and select the sda you want to auto mount, click 'OK' to configure.
- Click the "Assistant" button.
- Uncheck "Mount file system in read only mode" and keep "The file system is mounted at boot time" checked.
- Click the "Mount", "Apply" then "Close" button, and restart the system.
If you need to identify disk partitions by label, paste ls /dev/disk/by-label -g in Terminal, or to view partition sizes and file systems, enter sudo fdisk -l. Disk Utility mentioned in "Name or Label a Partition" also gives you a glance of device numbers, partition types, sizes and labels.