Problem is described here: http://askubuntu.com/questions/832794/cant-mount-partition-image-ntfs-3g-mount-mount-failed-permission-denied I created an image using the Disks tool, and then tried to mount it with Disk Image Mounter, and it asks for a password twice, but fails with the error: Unable to mount OLD SYSTEM_DRV Error mounting /dev/loop1 at /media/endolith/OLD SYSTEM_DRV: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000" "/dev/loop1" "/media/endolith/OLD SYSTEM_DRV"' exited with non-zero exit status 21: ntfs-3g-mount: mount failed: Permission denied If I use a command like sudo mount -t ntfs -o loop "Disk Image.img" /mnt/SYSTEM_DRV it works fine. This is Ubuntu 16.04.1
more exactly, I used mkdir /mnt/SYSTEM_DRV sudo mount -t ntfs -o loop "Disk Image.img" /mnt/SYSTEM_DRV
or even more exactly sudo mkdir /mnt/SYSTEM_DRV sudo mount -t ntfs -o loop "Disk Image.img" /mnt/SYSTEM_DRV and this is in MATE environment
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