Cdromupgrade folder missing in my iso file for ubuntu upgradtion

[Manoj_Arun_Kumar]

Hi,

I am trying to upgrade my ubuntu version from 15.04 to 15.10 through download ISO files.
When I tried to follow these steps, I am unable to find cdromupgrade folder in my iso files .

Step : Created dir & mounting loop device using following cmd

mkdir -p /media/cdrom
mount -o loop /media/deva/sda2/Ubuntu/ubuntu/ubuntu-15.10-desktop-i386.iso /media/cdrom/


root@deva-Lenovo-E4325:/media/cdrom# ll -lrth
total 45K
lr-xr-xr-x 1 root root 1 Oct 21 21:48 ubuntu -> ./
-r--r--r-- 1 root root 224 Oct 21 21:48 README.diskdefines
dr-xr-xr-x 1 root root 2.0K Oct 21 21:48 preseed/
dr-xr-xr-x 1 root root 2.0K Oct 21 21:48 pool/
dr-xr-xr-x 1 root root 2.0K Oct 21 21:48 pics/
dr-xr-xr-x 1 root root 2.0K Oct 21 21:48 dists/
dr-xr-xr-x 1 root root 2.0K Oct 21 21:48 .disk/
dr-xr-xr-x 1 root root 18K Oct 21 21:48 isolinux/
dr-xr-xr-x 1 root root 2.0K Oct 21 21:48 install/
dr-xr-xr-x 1 root root 2.0K Oct 21 21:48 casper/
dr-xr-xr-x 1 root root 2.0K Oct 21 21:48 boot/
dr-xr-xr-x 1 root root 2.0K Oct 21 21:48 ./
-r--r--r-- 1 root root 3.6K Oct 21 21:48 md5sum.txt
drwxr-xr-x 5 root root 4.0K Mar 13 19:02 ../
root@deva-Lenovo-E4325:/media/cdrom#

Can anyone guide me to upgrade my ubuntu system using downloaded ISO file ?

Note : I dont have internet connection for using updatemanager -d cmd.


Thanks
MAK