Неавторизованная ошибка ESM 401 в Ubuntu 16.04

Я хочу обновить свой сервер Ubuntu 16.04 до Ubuntu 18.04, и я запускаю для этого следующие команды;

apt update -y
apt upgrade -y
do-release-upgrade

apt update команда работает нормально со следующим output;

# apt update -y
Hit:1 https://esm.ubuntu.com/infra/ubuntu bionic-infra-security InRelease
Hit:2 https://esm.ubuntu.com/infra/ubuntu bionic-infra-updates InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
5 packages can be upgraded. Run 'apt list --upgradable' to see them.

Однако при запуске команды apt upgrade она возвращает следующие ошибки;

# apt upgrade -y
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done

*The following packages could receive security updates with UA Infra: ESM service enabled:
  libkrb5-3 libgssapi-krb5-2 libk5crypto3 libkrb5support0 libzstd1
Learn more about UA Infra: ESM service for Ubuntu 16.04 at https://ubuntu.com/16-04

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

The following packages have been kept back:
  libk5crypto3 libkrb5support0
The following packages will be upgraded:
  libzstd1
1 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
1 esm-infra security update
Need to get 189 kB of archives.
After this operation, 132 kB of additional disk space will be used.
Err:1 https://esm.ubuntu.com/infra/ubuntu bionic-infra-security/main amd64 libzstd1 amd64 1.3.3+dfsg-2ubuntu1+esm1
  401  Unauthorized
E: Failed to fetch https://esm.ubuntu.com/infra/ubuntu/pool/main/libz/libzstd/libzstd1_1.3.3+dfsg-2ubuntu1+esm1_amd64.deb  401  Unauthorized

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Я не знаю, что делать в данный момент. Как я могу это решить?