Alternate install CDs erroneously appearing as corrupt

Asked by Joseph Wakeling

I've been trying to install Kubuntu Feisty on my brand-new Lenovo ThinkPad R61 via the alternate install CD.

I've verified the md5sum of the downloaded ISO, k3b confirmed the data had been written correctly, and when I boot on the CD on my older Dell laptop and select the option to check the integrity of the disc, it passes.

However, once in the ThinkPad, installation fails, noting corrupt packages on the disc, and the integrity check also refers to corrupt packages. The same failure occurs with an Edgy alternate install CD.

There are some error messages which show up but vanish faster than I can effectively write them down---if anyone can advise on a way to get hold of this data I'd be grateful. The errors may be prevented by adding 'irqpoll' to the boot options.

I have tried liveCDs and other install methods for (K)ubuntu, Fedora and Sabayon and the laptop rejects them all. Among the errors on the liveCD are the tty error referred to in bug #106864; the described workaround does fails on my system.

I have posted details on the livecd errors on the Ubuntu forums at,

The specification for the ThinkPad R61 is here:$wwwPartNumLookup/_NA01EUK?OpenDocument

My suspicion is that the liveCD problems and the apparent "corruption" on the alternate install CD stem from the same problem, probably some major hardware issue that prevents the system from reading the CD properly, but I have no idea how to go about fixing it. I have tried adding a number of options to the initial install dialogue, such as irqpoll and/or acpi=off noapic, but to no avail.

Can anyone advise? Thanks in advance for any help.

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Benjamin Rubin (bnrubin) said :

1) Have you tried burning the ISO at the slowest speed that your drive supports? I don't know why it helps, but I have seen some CD read issues fixed by doing this.

2) You might be able to see those error messages that flash on the screen by using the Pause key on your keyboard.

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Joseph Wakeling (webdrake) said :

I suspect you are right as I was finally able to install from a magazine cover DVD. I can't check as right now I'm in a different country from the original machine that did the burning!

I'll report back when I have the chance.

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Dennis Dirdjaja (dcd-ditsch) said :

I suppose you either have been burning the CD too fast or your drive is rejecting the sort of CDs you are using. I have seen drives which work fine with some brands of CDs and don't work with another, mostly low-budget CDs.

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