Hello! I have followed the installation instructions to Ubuntu 18.04, but I have got an error like so:

oalexandrino@olavo-dell-pc:~$ sudo apt-get update

Reading package lists... Done

E: Release file for https://dl.packager.io/srv/deb/opf/openproject/stable/10/ubuntu/dists/18.04/Release is not valid yet (invalid for another 18min 4s). Updates for this repository will not be applied.

oalexandrino@olavo-dell-pc:~$ sudo apt-get install openproject

Reading package lists... Done

Building dependency tree

Reading state information... Done

E: Unable to locate package openproject

EDIT

By investigating I have discovered that the following link is missing:

# This file was generated by dl.packager.io deb https://dl.packager.io/srv/deb/opf/openproject/stable/10/ubuntu 18.04 main

https://dl.packager.io/srv/deb/opf/openproject/stable/10/ubuntu

It appears to me that no one has updated the "Install OpenProject with DEB/RPM packages" web page.

https://docs.openproject.org/installation-and-operations/installation/packaged/#ubuntu-1804

is anyone in the community able to help?

PS: 

My Ubuntu version is:

Ubuntu 18.04.4 LTS

Release: 18.04

Codename: bionic