Looks like the issue has something to do with net-ssh. There are some other similar errors people were having.
The easy way to resolve the issue is to install oxidized using git.
Make sure rake is installed
sudo dnf install rake or sudo apt install rake
Install Oxidized from Git
Steps were copied from here. https://github.com/ytti/oxidized#build-from-git
You should be able to copy and paste these commands in the users home directory.
git clone https://github.com/ytti/oxidized.git cd oxidized/ gem install bundler rake install
After it is installed, restart the service
systemctl restart oxidized
Or continue on installing and with LibreNMS