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I’m a new user to Linux and so I used the automatic Windows dual boot installer and it installed Ubuntu 64-bit 12.10 on my XP computer. But some of the Xilinx programs I need to run require 32-bit. So I need to either re-install or delete it and start over.

I've created a clean 32-bit Ubuntu install DVD but when I run it, it doesn't recognize that I already have a 64-bit version of Ubuntu installed so it doesn't give me a way to delete it. There is the other option that should allow me to delete the partition but it doesn't show an Ubuntu partition, just a 150M Windows partition.

I don't care about anything in the Ubuntu directories so a full erase is okay. I can't seem to find any description on the web that match my problem so I'm not sure how to proceed.

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The installation was done via Wubi? – Andfoy Jan 15 '13 at 21:52
As it usually should be no problem to run 32-bit applications in a 64-bit Ubuntu you also may want to consider rewording you question like e.g. "How do I install Xilinx <specific name of application> in a 64-bit Ubuntu" (press edit to do so). Also see… – Takkat Jan 16 '13 at 8:34

If you're running 64-bit ubuntu, you can choose to run either 32-bit mongo or 64-bit mongo, as takkat mentioned. (a 32-bit OS would force you to use only the 32-bit executable.)

Personally, I find it simpler and more predictable to just go to the 10gen distributions page, and download and untar the version I want. After that, executing the right bin/mongod just works right out of the box.

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