404 Fetching Error when trying to update xubuntu 14.04 to 16.04

[vbmacit]

when I use this command sudo do-release-upgrade I always get the error which is given below


Err http://us.archive.ubuntu.com xenial/universe Sources

Err http://us.archive.ubuntu.com xenial/universe amd64 Packages

Err http://us.archive.ubuntu.com xenial/universe i386 Packages

Err http://us.archive.ubuntu.com xenial/universe Sources
404 Not Found [IP: 91.189.91.26 80]
Err http://us.archive.ubuntu.com xenial/universe amd64 Packages
404 Not Found [IP: 91.189.91.26 80]
Err http://us.archive.ubuntu.com xenial/universe i386 Packages
404 Not Found [IP: 91.189.91.26 80]
Fetched 2.874 kB in 6s (0 B/s)

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
http://us.archive.ubuntu.com/ubuntu/dists/xenial/universe/source/Sources
404 Not Found [IP: 91.189.91.26 80]
, W:Failed to fetch
http://us.archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-amd64/Packages
404 Not Found [IP: 91.189.91.26 80]
, W:Failed to fetch
http://us.archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-i386/Packages
404 Not Found [IP: 91.189.91.26 80]
, E:Some index files failed to download. They have been ignored, or
old ones used instead.

[1fallen]

The simplest solution is to do the following two steps:

1. Backup your sources list

sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup

Open the sources file /etc/apt/sources.list and rename all the instances of "us.archive" or archive in

http://us.archive.ubuntu.com/ubuntu/

to


http://old-releases.ubuntu.com/ubuntu/

Also do the same for all the ubuntu.com xenial entry's.


Run:

sudo apt update ##after doing the above.

That "should" fix the issue.