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I was trying to upgrade my ubuntu version to 12.04 but it failed to get the last three packages out of 1525. I tried it many times but failed. Is there any way that I can download the three packages separately and continue with my system upgrade? Any help is appreciated.

Thanks in advance. Selam

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What have you done so far? What commands have you entered? is the system up to date? – Alvar Jun 11 '13 at 13:31
What were the three packages that were failing? What version are you currently running? – Malachi Jun 11 '13 at 14:06
What version are you starting with? See UpgradeNotes – chaskes Jun 11 '13 at 14:24
The only Ubuntu release still supported to upgrade to 12.04 is 10.04. server. All other releases reached end of life:… – Takkat Jun 11 '13 at 14:32

Are you upgrading to 13.04?

Try to boot on the 13.04-cd/usb, and click "Install Ubuntu". You will get a few options about installing/upgrading. Click the Upgrade one. It will keep your personal files, but reinstall the default apps.

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