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Upgrade begins in the terminal, runs for a few minutes downloading 'trusty' packages and then stops with the error message below:

W:Failed to fetch 
http://extras.ubuntu.com/ubuntu/dists/oneiric/main/source/Sources 404 
Not Found 
E:Some index files failed to download. They have been ignored, or 
old ones used instead. 
Restoring original system state
Aborting

Note the 'oneiric' - I did upgrade from oneiric to precise a few years back and have always got error messages when updating, referring to 'oneiric'. I have tried to follow advice on here for upgrading and have not found and other questions that have given me the answer to this puzzle.

Zanna
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johnnyhrvat
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2 Answers2

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Thanks for the help - now downloaded. I managed to piece it together from the answers here but I probably could have done with someone 'holding my hand' through the process! For anyone coming later with a similar problem, this is the cure in Terminal.

sudo -i

gedit /etc/apt/sources.list

Opens a gedit document - put a # before any line that includes oneiric (in my case) - save and close.

logout

sudo apt-get update

There should be no more error messages. Then upgrade if you wish.

sudo apt-get upgrade
johnnyhrvat
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To convert my comment to an answer, when upgrading you need to clean up your repositories.

First step, back up your data, just in case there is a problem with the upgrade.

Second, read the release notes: https://help.ubuntu.com/community/UpgradeNotes

In your case, https://wiki.ubuntu.com/TrustyTahr/ReleaseNotes and https://wiki.ubuntu.com/TrustyTahr/ReleaseNotes#Upgrading_from_Ubuntu_12.04_LTS_or_Ubuntu_13.10

Then you disable all ppa and any third party repositories. After the upgrade you can re-enable them but you always need to check as sometimes 3rd party repos and ppa lag or go unmaintained.

Along those lines, do not mix and match repositories across versions of Ubuntu. So do not use a mix of 14.04 with any other release such as 16.04 or what have you.

See https://help.ubuntu.com/community/Repositories/Ubuntu and https://help.ubuntu.com/lts/serverguide/configuration.html

To restore your repositories see https://repogen.simplylinux.ch/

For the old 12.04 repositories see How to install software or upgrade from an old unsupported release?

You can then proceed with the upgrade, see How do I upgrade to a newer version of Ubuntu?

After the upgrade, as I indicated, you can add or re-enable ppa.

Panther
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