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
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.