Want to test Ubuntu 12.04 ISO, and remove the lock

Use chown to set the owner to your user. Did you by any chance run either the zsync or web browser using sudo as this will cause this.

I don't get what you mean by this "Did you by any chance run either the zsync or web browser using sudo as this will cause this."

Indeed this is what I did previously.
____________________________________________________________________________________________________________________
rohit@rohit-Aspire-4720Z:~/Downloads$ ls
gnome_shell___dark_shine_by_satya164-d4ekdco.zip ubuntu-12.04-desktop-i386.iso
gnome-shell-extensions-common_3.2.0-0ubuntu1~oneiric1_all.deb ubuntu-12.04-desktop-i386.iso.part
gnome-shell-extensions-user-theme_3.2.0-0ubuntu1~oneiric1_all(1).deb ubuntu-12.04-desktop-i386.iso.zs-old
gnome-shell-extensions-user-theme_3.2.0-0ubuntu1~oneiric1_all.deb ubuntu-12.04-dvd-i386.iso.part
Oceanis_Change_Background_W7.zip wubi.exe
personalization_setup.zip zsync.1.gz
rohit@rohit-Aspire-4720Z:~/Downloads$ sudo zsync http://ftp.iinet.net.au/pub/ubuntu-releases/12.04/ubuntu-12.04-desktop-i386.iso.zsync
[sudo] password for rohit:
#################### 100.0% 45.4 kBps DONE

reading seed file ubuntu-12.04-desktop-i386.iso: *************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************Read ubuntu-12.04-desktop-i386.iso. Target 100.0% complete. *********
Read ubuntu-12.04-desktop-i386.iso.part. Target 100.0% complete.
verifying download...checksum matches OK
used 735358976 local, fetched 0
rohit@rohit-Aspire-4720Z:~/Downloads$
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And I wanted to know is it the right ISO I downloaded, and is it Wubi installer or Linux based. And if possible if you don't mind how to chown this ISO.

Please help needed

And if this ISO is file I am gonna use USB to upgrade my Ubuntu 11.10 version.

rohit@rohit-Aspire-4720Z:~/Downloads$ ls -alk
total 1442872
drwxr-xr-x 2 rohit rohit 4 2012-05-28 20:19 .
drwxr-xr-x 47 rohit rohit 4 2012-05-28 18:51 ..
-rw-rw-r-- 1 rohit rohit 30 2012-05-27 21:54 gnome_shell___dark_shine_by_satya164-d4ekdco.zip
-rw-rw-r-- 1 rohit rohit 54 2012-05-27 21:14 gnome-shell-extensions-common_3.2.0-0ubuntu1~oneiric1_all.deb
-rw-rw-r-- 1 rohit rohit 6 2012-05-27 21:13 gnome-shell-extensions-user-theme_3.2.0-0ubuntu1~oneiric1_all(1).deb
-rw-rw-r-- 1 rohit rohit 6 2012-05-27 21:13 gnome-shell-extensions-user-theme_3.2.0-0ubuntu1~oneiric1_all.deb
-rw-rw-r-- 1 rohit rohit 3250 2012-05-26 10:50 Oceanis_Change_Background_W7.zip
-rw-rw-r-- 1 rohit rohit 454 2012-05-26 10:53 personalization_setup.zip
-rw------- 1 root root 718124 2012-04-23 12:27 ubuntu-12.04-desktop-i386.iso
-rw------- 1 root root 718124 2012-04-23 12:27 ubuntu-12.04-desktop-i386.iso.zs-old
-rw------- 1 root root 344 2012-05-28 13:19 ubuntu-12.04-dvd-i386.iso.part
-rw-rw-r-- 1 rohit rohit 2446 2012-05-28 09:59 wubi.exe
-rw-rw-r-- 1 rohit rohit 2 2012-05-28 12:59 zsync.1.gz

I did this

Downloads$ sudo chown root:admin ubuntu-12.04-desktop-i386.iso
-rw------- 1 root admin 718124 2012-04-23 12:27 ubuntu-12.04-desktop-i386.iso

But still it is locked.

Its because you are using sudo with the zsync, it is making the file be owned by root. It doesn't need sudo as the data is in your home directory which you have write access to. If you use sudo when it's not needed you will get issues. If you run:

sudo chown rohit:rohit ~/Downloadsubuntu-12.04-desktop-i386.iso

It will be owned by your user.

sudo chown rohit:rohit ~/Downloads ubuntu-12.04-desktop-i386.iso

Above code did work for me .
Thanks for this. I tried it with ISO master, it didn't work indeed. hmmm.

I got this now

rohit@rohit-Aspire-4720Z:~/Downloads$ md5sum ubuntu-12.04-desktop-i386.iso
d791352694374f1c478779f7f4447a3f ubuntu-12.04-desktop-i386.iso

And is it Wubi or Linux package. How to know it. Last help :)

Wubi is on the CD last I checked, you can run wubi from where it is now and the ISO will be used.

Once again, don't use sudo when it's not needed.

Hmm.. How to do that. Can I upgrade from ISO within harddisk or any other option wherein I can upgrade running 11.10 using this ISO. And I will make sure not to use Sudo for everything.

Since I never upgraded or used Wubi. So is their option in Wubi to upgrade running Ubuntu or is that I should get bootable USB with this Wubi and boot it for upgrade

Since Wubi gets inside windows bootloader. And presently I have grub

Let me rephrase the question.
how to upgrade the running Ubuntu 11.10 from Ubuntu 12.04 Wubi ISO I have now

I did install using Ubuntu ISO restarted and installed it. Its great. Thanks actionparsnip (andrew-woodhead666) for your good suggest. You are so kind and helpful :)