u can extract isoimage contents using isomaster.apt-get install it.
while u can mount iso image as
(sudo -for ubuntu) mount /dir-of-iso/xyz.iso /mnt -o loop
^where / dir-of-isois the dir path where iso rests.
u can open a terminal and type "su" press enter give roots passwd and run above command.
above command mounts iso image in /mnt dir.
u can install
u can use
chmod command as root/sudo to allow the dir u want to give full access to.
using su to login as root in a terminal,
try chmod 777 /var/cache/apt/archives
^will make it writable and vulnerable to.this is not the way to do it.
u can add the user's group to be there.and this is not a good practice i believe.
In my opinion dont do that instead make a shortcut on ur Gnome applications>system menu as following link describes.this is the way.
How to browse files/folders as root user in Nautilus
http://ubuntuguide.org/wiki/Ubuntu:F...er_in_Nautilus
^no jhanjhats
@cyrus:
u can open a terminal and type "su" and give root's password to have root privilage.it is not at all recommended to enable root account for login.yeah u can use gdmsetup to do that.