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i tried to install ubuntu 12.04 but it said that you need the required kernal to install ubuntu 12.04. so unable to boot. so please help me to install it on my X86 pc( AMD processor with windows vista installed.)

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Did you correctly download the amd ubuntu 12.04 iso and make a bootable pen drive with it? – harisibrahimkv May 2 '12 at 7:03
i downloaded ubuntu-12.04-desktop-i386.iso and precise-desktop-i386.iso. and i created it using universal usb creator but it again show that i need the required kernal to install and thus unable to boot. please help me to install 12.04. – Deepak rathi May 2 '12 at 7:07
I don't know for sure, but I think you need the AMD version to install it on your system. The i386 version is for intel processors. – harisibrahimkv May 2 '12 at 7:11
My bad. It seems that the iso you downloaded works for all the systems as per the detail here : I do not know about universal usb creator. Do you have another ubuntu installation available somewhere? Then you can use "Startup disk creator" to make a bootable pen drive. – harisibrahimkv May 2 '12 at 7:17
i successfully installed the ubuntu 11.10 on my same pc.but could not installed 12.04. i have tried to install on virtual box but all in vain.i cant install it – Deepak rathi May 2 '12 at 7:17

Follow the instructions on Ubuntu Download page, to create an install CD/USB on your Windows platform. This DOES require the 'bootloader', which is downloaded separately.

Even better, have a friend with Ubuntu create a USB for you. All needed tools, elements are now included in standard install (once installed).

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Did you check your file integrity? Maybe the ISO file is not downloaded correctly.

You should test the integrity of the ISO file to make sure the file is downloaded correctly. If you have another Linux machine, use the md5sum your-ubuntu-image.iso command with your ISO file to find out the MD5 hash code. In my case, the command looks like this:

md5sum ubuntu-12.04-desktop-amd64.iso

And the output is:

128f0c16f4734c420b0185a492d92e52 ubuntu-12.04-desktop-amd64.iso

Then you can check if the resulting hash code matches with MD5SUMs provided by Canonical at this link.

If you don't have another Linux machine, you can also do this on a Windows machine by downloading a proper tool for file hash checking.

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@Deepak rathi Use the file ubuntu-12.04-desktop-i386.iso. For this file the output would be: d791352694374f1c478779f7f4447a3f ubuntu-12.04-desktop-i386.iso – irrational John May 2 '12 at 12:48

I am encountering the same issue, I found a workdaround, stack your CD/USB in the driver. boot, press return then select your language, then press F6, disable all options and press return, you should now be able to boot from CD, then from there do a full install in the graphical interface

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i checked all the options but i cant install ubuntu 12.04. it saying that i lacks the required kernals to install that. – Deepak rathi May 4 '12 at 15:23

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