[Qlustar-General] installing Qluman on workstation

Reinstalling Qluman interface on my VM Virtualbox workstation.

All worked fine then I needed to reload Virtualbox. Did a clean install on Ubuntu 16.04 and I received the following error message will trying to access the public key.

root@workstation:~# dpkg -l software-properties-common > /dev/null 2>&1 || apt install software-properties-common root@workstation:~# gpg --no-default-keyring --primary-keyring /etc/apt/trusted.gpg --recv-keys E6BA110F3C0BC307 gpg: no keyserver known (use option --keyserver) gpg: keyserver receive failed: bad URI root@workstation:~# gpg --no-default-keyring --primary-keyring /etc/apt/trusted.gpg --recv-keys E6BA110F3C0BC307 gpg: no keyserver known (use option --keyserver) gpg: keyserver receive failed: bad URI