Unable to install in Ubuntu 16 using npm as previously supported
### Current Situation

Previously the homebridge installation was using npm using this command
sudo npm install -g --unsafe-perm homebridge homebridge-config-ui-x

We are using Ubuntu 16 on FriendlyArm NanoPi Neo.
Today I tryed to make a new homebridge installation, but it wasen´t possible to install gpg since it is not available.
The gpg version installed is gpg (GnuPG) 1.4.20
Then I tryed to use the old npm installation and this resulted in errors as well.

Please leave an option to be able to install HomeBridge on  Ubuntu 16.04.7 LTS

### Proposed Change

Leave an option to install homebridge as previously using npm

### Additional Context

_No response_