Following is what I get as error

Error during update 

A problem occurred during the update. This is usually some sort of 
network problem, please check your network connection and retry. 

W:Failed to fetch 
404 Not Found 
, W:Failed to fetch 
404 Not Found 
, W:Failed to fetch 
404 Not Found 
, W:Failed to fetch 
404 Not Found 
, E:Some index files failed to download. They have been ignored, or 
old ones used instead. 

Restoring original system state

I am using command line do-release-upgrade

I have changed my dns to google public dns and verified that using nslookup and host -v

I could not find bg.archive.ubuntu.com in any of the source list files.

In another tab I have ping google running just to verify that network is not down. Network has no issues.

  • Are you connected via wireless? I've had some similar issues while upgrading. Try wired connection (ethernet).
    – user123492
    Oct 25 '13 at 15:34
  • Honestly, connecting wired is pain, I will rather stick to 13.04 :) till I find this problem's solution
    – Mohit
    Oct 25 '13 at 15:54
  • its not recommended to install 13.10 since its support is withdrawn and you will not get system updates. better install 14.04 which much stable than 13.10 Nov 23 '14 at 4:39

This has to do with old distros being archived. I found a previous question that talks about it

How to install software or upgrade from an old unsupported release?

along with a ubuntu page here

Hope this helps.

Edit: The steps I had to take turned out to be a tad different than what was suggested. I changed the bg.archive.ubuntu.com found in /etc/apt/source.list.d/precise.list to old-releases.ubuntu.com and things worked like a charm.

  • The OP stated "from 13.04", but has "natty-backports" ... so you might have a point here.
    – guntbert
    Oct 25 '13 at 17:21

I would try installing the upgrade from a DVD or USB flash drive. It might work, and I think there is an option on the USB or DVD to upgrade your current Ubuntu installation so you lose no files. Of course, I recommend backup first! If that doesn't work, I would try a full re-installation of Ubuntu which would reformat your old installation of Ubuntu and reinstall from scratch. Then just restore all your files from a backup that you created, if you have important files on it. Good luck!

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