Ubuntu mount disk read write

make gnome disk image mounter read and writable

gnome-disk-image-mounter

sudo nano -w /usr/share/applications/gnome-disk-image-mounter.desktop

append

Exec=gnome-disk-image-mounter %U

Exec=gnome-disk-image-mounter %U --writable

close, then restart file manager

nemo -q
nautilus -q