This is fairly straight forward to resolve. You can run the following command and replace /media/username/drive with the path to your drive.
sudo chmod ugo+wx /media/username/driveIf you need to locate the path to your drive, try running
lsblk
It should show all the hard drives mount points
https://askubuntu.com/questions/90339/how-do-i-set-read-write-permissions-my-hard-drives
Find UUID
blkid
Example output
/dev/xvdb1: UUID="42fbe9a1-eea1-34bc-439d-19a0b48e7df1" TYPE="xfs"
Mount drive using the UUID
[root@host ~]# mount -U 42fbe9a1-eea1-34bc-439d-19a0b48e7df1 /mnt
Add to fstab to automatically mount on system boot up
vi /etc/fstab
Add the following, swap out the UUID for your devices UUID
UUID="42fbe9a1-eea1-34bc-439d-19a0b48e7df1" /backup xfs defaults 0 0
Save and exit. Now when the system reboots it should automatically mount the drive. You should also be able to call “mount -a” to automatically mount everything in fstab.