Keyserver fauilure

Hey, I got a problem when I would like to add your repositiories to my workspace.

As it said here: Package Repositories - Magni Documentation,

Ubuntu 20.04 Virtual Machine, ROS Noetic version

To add the repositories i have to type this commands:

Add the source to your apt lists:
sudo sh -c 'echo "deb https://packages.ubiquityrobotics.com/ubuntu/ubiquity focal main" > /etc/apt/sources.list.d/ubiquity-latest.list'
Add our signing key to your trusted list:
sudo apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key C3032ED8
sudo apt-get update

But when I type the 2nd command (“sudo apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key C3032ED8”)

I always get an error like:

imre@imre-VirtualBox:~$ sudo apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key C3032ED8
Executing: /tmp/apt-key-gpghome.lq1BYPPfxl/gpg.1.sh --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key C3032ED8
gpg: keyserver receive failed: Server indicated a failure

Yours Faithfully,
Imre