I have run the command sudo update-manager -d through terminal. The manager opens and it shows a new version 13.04 but when I click upgrade it doesn't upgrades it just closes. Is it the fault of any of the sources?
closed as off topic by Jorge Castro, fossfreedom♦ Nov 26 '12 at 23:35
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As far as I have checked, 13.04 is pretty much in a pre-alpha stage, which means that, until a couple of months pass of more work, the work to get it to upgrade from 12.10 to 13.04 will not work correctly for all systems. Your best bet if you still want to use it is to use one of the daily ISOs here: http://cdimage.ubuntu.com/daily-live/current/
(You will need a DVD or USB to use the ISO image)
Also if we look at the Release Schedule here: https://wiki.ubuntu.com/RaringRingtail/ReleaseSchedule
you will notice the following:
Alpha release on December 6th and February 7th.
So please wait at least until the Alpha 1 version to test the update, but my suggestion would be to wait at least for the Beta or RC before testing.
Because is safer for you to test 13.04 without so many errors prone from Unity, Compiz, Kernel, etc.. and you have a better idea of the stability, performance and speed of the final 13.04.
If you want to upgrade, not install a fresh system off of a DVD or USB device, you can use this method suggested on the #ubuntu+1 IRC channel:
This will shift all of your sources to Ubuntu 13.04 and then upgrade you system. Ubuntu 13.04 is still in development, so don't do this if you have data you don't want to risk being deleted by accident!