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Ubuntu/Linux newbie here.

Xubuntu 16.04.1 is installed on /dev/sda and old disk is now /dev/sdb and contains two partitions: the old Recovery Environment, as /dev/sdb1, in case things go wrong or I need to put original Dell system back, and the Windows-Ubuntu common play area, /dev/sdb2 as NTFS, for general data, such as downloads, audio & video etc.

The primary user, which was created during Ubuntu installation, can mount and unmount /dev/sdb2 freely. And it always mounts as /media/username/Partition_Label/ . I then created a non-administrative second user on the same machine for my other household member and in theory she has rights to un/mount disks. So much so that the external exFAT HDD when plugged to the USB port can be mounted by that user via desktop action (double-clicking the disk icon for the partition). However, that second user cannot do the same to mount /dev/sdb2: it asks for the password of the primary user to mount it.

How can I solve this? Why can an USB-plugged external HDD be freely mounted by the non-admin user but the second internal HDD cannot?

If logs or screenshots are needed, please let me know of what.

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    If it's an internal drive, just add an entry for it in /etc/fstab so that it is mounted automatically at boot time. – fkraiem Nov 20 '16 at 6:18
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You need to add the drive at /etc/fstab file, you can use my recent answer to help yourself to do this: Mounting a device by fstab file

Might it helps.

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Non-root users can use udisksctl command. Unlike mount command it doesn't require sudo privillege. It also checks if you have entry for the partition/drive in /etc/fstab, and if you do , it will mount to directory specified there.For instance,

$ udisksctl mount -b /dev/sdb6                                                                                           
Mounted /dev/sdb6 at /mnt/HDD.

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