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I have downloaded "ubuntu-12.04.1-desktop-i386.iso" and extracted it using magic ISO. There is a file wubi.exe is the extracted folder. To install ubuntu i double clicked it ( i am using windows 7); it asks the isntallaton folder and asks to create username and password. Then straight away it says it is downloading "ubuntu-12.04.1-wubi-i386.tar.xz". It it shows nearly seven hours of downloading time remaining (i have a slow internet connection). Can't i install ubuntu offline? Thank you in advance.

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up vote 2 down vote accepted

Since you already have the iso (you didn't have to, the wubi.exe installer can be downloaded independently), there is no need to download the installation package again.

Just place the iso image in the same folder where the wubi.exe file is; start wubi.exe -- it should detect the iso file and run the installation offline. More on that here.

Alternatively, you can use the iso to install Ubuntu on a separate partition.

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I figured out what the problem was. I placed wubi.exe in the folder that contained the iso file. Then the installation completed. thanks – Prakash Gautam Sep 21 '12 at 8:51

If you want to do a full install you will need to burn the iso to a CD and start your computer from it. Check this question

If you don't have a CD avaliable, check: How do I install Ubuntu from an USB drive? or Is it possible to install without a CD or USB drive?

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No need to do that. If he wants to use WUBI, the WUBI can use the ISO image for installation, am I wrong? – January Sep 21 '12 at 7:46
I don't know, Wubi was always quite unreliable for me. If he really wants to use Wubi he can, but if he doesn't know what wubi is, quite likely, a full install will be a better experience. – Javier Rivera Sep 21 '12 at 8:26
I completely agree (OK, so I don't know about reliability, because I never used Windows outside of a Vbox); on the other hand, it is easier to break Windows with a botched attempt to install Ubuntu side by side, and that can be one hell of a bad experience. – January Sep 21 '12 at 8:29
Thanks for the help. I installed it now. – Prakash Gautam Sep 21 '12 at 8:52

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