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I downloaded an ubuntu image file, but its size is 30 MB more than a CD can hold. Also, my computer can not boot through a DVD or USB drive; what should I do? Please help!

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Really you have multiple choices:

First of all you can try a bigger Cd capacity(there are 800 MB CD's)

You can try The Network installation or Install directly from Internet.

Please check this

Here is a list alternate installations so read and choose the one that helps you

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You could download the alternate Ubuntu iso from here:

For the Ubuntu 12.04.4 64bit click here

For the Ubuntu 13.10 64bit click here

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Install 12.04 using Wubi


Note: This is if you running windows.

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Ubuntu 12.04 will run from CD. See Ubuntu download page here:

A "700MB" CD would be a good start. They can fit 737MB on (because the advertised number is actually a MiB) and even then there's often some overburn space. I've got to over 750MB on a 700MB disk

After installing 12.04 either you can upgrade to 12.10 and so on or wait till April 17 and you can directly upgrade to 14.04LTS

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