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I have recently installed 8GB Ram into my ubuntu machine but when I look on the specs it only comes up with 2.8GB of Ram so I want to upgrade to 12.04 but when I try to upgrade it says it can't because it cant find the archive to update a program first and when it tries to delete or update the program it dosent work. So how do I upgrade to 12.04 with these problems?

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3 Answers

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It sounds like you aren't using a PAE kernel and your 11.10 is 32-bit. Is this right? In order to address all 8GB of RAM you should consider starting over with a 64-bit operating system.

As for the upgrade, you should disable all 3rd party sources, then try to update your system. Then upgrade.

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your right about the 32bit and how do you disable 3rd party sources? – Selby Collins Jun 20 '12 at 15:38
Open up the Ubuntu Software Center, then find the menu entry for 'software sources'. Here you will see a list of the repositories configured for your machine. Uncheck the ones that you remember adding manually and click close. Then do sudo apt-get update, sudo apt-get upgrade, then upgrade to 12.04. – Dean Howell Jun 20 '12 at 16:09
ok thanks for the advice – Selby Collins Jun 20 '12 at 16:32
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To use full RAM you need to enable PAE.

sudo apt-get install linux-generic-pae linux-headers-generic-pae

For Upgrade

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I'll give you an upvote just for all the screenshots. Where did you find a computer that just happened to be missing these packages, so you could go through the installation and take all these? =) – Tomas Lycken Jun 20 '12 at 16:05
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This not the missing package image. This image show how to upgrade to 12.04. Please check 1st before judge. :) – penreturn Jun 20 '12 at 16:13
Well, you had a computer at hand which you could upgrade and take screenshots. Dedication deserves reputation! – Tomas Lycken Jun 20 '12 at 22:25
up vote 0 down vote

Addressing the first part of your question, 32-bit operating systems, whether Windows or Ubuntu, will not recognize all of your new memory. To recognize all of your memory you will need to install a 64-bit operating system. The simplest way would be to download the 64-bit (not the recommended version) of Ubuntu and install it.

Remember to backup any important files before you do this. I just did the install and I thought by default it would ask me where to install it. It didn't. Know I have to figure out if it installed in the correct place and redo the install if it didn't. I have several operating systems on my computer and wanted the latest version of Ubuntu to be install on my new Solid State Drive (SSD).

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Or, to recognize all the memory, one can run a PAE kernel on a 32-bit operating system, which Ubuntu fully supports. In Ubuntu 12.04, the PAE kernel is the only packaged 32-bit kernel. – Eliah Kagan Jun 20 '12 at 21:56

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