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I use Ubuntu 12.04 LTS. I tried to upgrade it to 14.04 by booting from a usb stick. In the menu there were just two options - one was to install 14.04 by erasing 12.04 and another was to install 14.04 by erasing everything. But problem is both of them said that my documents, downloads and musics will be erased totally. Is there a way in which I can upgrade my OS to 14.04 without losing any data?

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Yes, but not from a usb stick if I understand correctly. You will have to get online to where you can upgrade directly from the ubuntu servers.

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I am commenting from my PC. So I am online. Now tell me what I have to do? – Md. Taufique Hussain May 4 '14 at 18:10
Go to a terminal and open update-manager, it will (hopefully) inform you that another LTS version has been released and allow you to upgrade to it. – user277907 May 4 '14 at 18:14
It's showing "New Ubuntu release 12.10 is available." not 14.04. :/ – Md. Taufique Hussain May 4 '14 at 18:21
Run the software-properties-gtk program and click the 'updates' tab. Then go down to where it says "Notify me of a new version" and choose 'For long-term support versions', then repeat update-manager. – user277907 May 4 '14 at 18:32
Are you sure upgrade from 12.04 to 14.04 is supported by Ubuntu? Because I tried it before you told me to do and it wasn't working. – Md. Taufique Hussain May 5 '14 at 6:29

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