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This is my server:

Welcome to Ubuntu 16.04.6 LTS (GNU/Linux 4.4.0-142-generic x86_64)

$ lsb_release -a

Distributor ID: Ubuntu
Description:    Ubuntu 16.04.6 LTS
Release:    16.04
Codename:   xenial

I want to upgrade it at ubuntu server 18.04

more /etc/update-manager/release-upgrades

# Default behavior for the release upgrader.

[DEFAULT]
# Default prompting behavior, valid options:
#
Prompt=lts

$ sudo do-release-upgrade or $ sudo do-release-upgrade -d

Descargando Error http://es.archive.ubuntu.com/ubuntu bionic-updates/main i386 unattended-upgrades all 1.1ubuntu1.18.04.8

404 Not Found
Error http://es.archive.ubuntu.com/ubuntu bionic-updates/main i386 unattended-upgrades all 1.1ubuntu1.18.04.8

404 Not Found
Obtenidos 0 B en 0s (0 B/s)
Error http://es.archive.ubuntu.com/ubuntu bionic-updates/main i386 unattended-upgrades all 1.1ubuntu1.18.04.8

404 Not Found
Error http://es.archive.ubuntu.com/ubuntu bionic-updates/main i386 unattended-upgrades all 1.1ubuntu1.18.04.8

404 Not Found
Obtenidos 0 B en 0s (0 B/s)
Error http://es.archive.ubuntu.com/ubuntu bionic-updates/main i386 unattended-upgrades all 1.1ubuntu1.18.04.8

404 Not Found
Error http://es.archive.ubuntu.com/ubuntu bionic-updates/main i386 unattended-upgrades all 1.1ubuntu1.18.04.8

404 Not Found
Obtenidos 0 B en 0s (0 B/s)
Failed to fetch http://es.archive.ubuntu.com/ubuntu/pool/main/u/unattended-upgrades/unattended-upgrades_1.1ubuntu1.18.04.8_all.deb

404 Not Found

I had verified file dosn't exists however the file http://es.archive.ubuntu.com/ubuntu/pool/main/u/unattended-upgrades/unattended-upgrades_1.1ubuntu1.18.04.9_all.deb exists

sudo do-release-upgrade -c

[sudo] password for xxxxxx: 
Checking for a new Ubuntu release
New release '18.04.2 LTS' available.
Run 'do-release-upgrade' to upgrade to it.

I get the same result when applying the list of mirrors obtained with apt-select --country ES (example: mirror.tedra.es)

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