Error in network definition: expected mapping (check indentation)

[Marietto2008]

tried to install opennebula on ubuntu 20 :

root@ziomario-I5:/home/ziomario/Scrivania# sudo bash minione

Checks & detection

Checking augeas is installed SKIP will try to install
Checking AppArmor SKIP will try to modify
Checking for present ssh key SKIP
Checking (iptables|netfilter)-persistent are installed SKIP will try to install

Main deployment steps:

Install OpenNebula frontend version 5.12
Configure bridge minionebr with IP 172.16.100.1/24
Enable NAT over enp3s0
Modify AppArmor
Install OpenNebula KVM node
Export appliance and update VM template
Install augeas-tools iptables-persistent netfilter-persistent

Do you agree? [yes/no]:
yes

Installation

Updating APT cache OK
Install augeas-tools iptables-persistent netfilter-persistent OK
Creating bridge interface minionebr OK
Bring bridge interfaces up FAILED

--- STDERR ---
/etc/netplan/01-network-manager-all.yaml:2:9: Error in network definition: expected mapping (check indentation)
network:
^

this is my 01-network-manager-all.yaml file :

Let NetworkManager manage all devices on this system

network:
version: 2
renderer: NetworkManager

#ethernets:
#eno1:
#dhcp4: no
#disable existing configuration for ethernet
#addresses: [10.0.0.30/24]
#gateway4: 10.0.0.1
#nameservers:
#addresses: [10.0.0.10]
#dhcp6: no

add configuration for bridge interface

#bridges:
#br0:
#interfaces: [eno1]
#dhcp4: no
#addresses: [10.0.0.30/24]
#gateway4: 10.0.0.1
#nameservers:
#addresses: [10.0.0.10]
#parameters:
#stp: false
#dhcp6: no

[xorel]

That looks like a problem in your netplan network definition, minione only creates /etc/netplan/minione.yaml when it detect netplan is used.