After running these commands from the command line:
sudo apt-get update
sudo apt-get dist-upgrade
sudo do-release-upgrade -d
I get the following error message:
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.
How can I fix this bug?
First, try to disable any software sources added manually, as this is probably the source of your error message.
See the following link for more details:
How can I fix a 404 Error when using a PPA or updating my package lists?
If this doesn't work, you can try the following commands to rebuild the cache (As suggested in the link below).
cd /var/lib/apt
sudo mv lists lists.old
sudo mkdir -p lists/partial
sudo apt-get update
Cannot upgrade from 12.04LTS to 14.04
Also, unless you want to try to install the latest devel. version, I would suggest you to drop the "-d" and simply run sudo do-release-upgrade.
