Install latest/edge of opennds
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install using the command line
sudo snap install opennds --edge
Don't have snapd? Get set up for snaps.
OpenNDS is a high performance, small footprint Captive Portal, offering by default a simple splash page restricted Internet connection yet incorporates an API that allows the creation of sophisticated authentication applications.
After installing the snap you can adjust the configuration file in /var/snap/opennds/common/opennds/opennds.conf following the documentation at https://openndsdocs.readthedocs.io/en/stable/
Then you need to allow the snap access to the firewall, network configuration, mount information and some system resources with the commands
sudo snap connect opennds:firewall-control
sudo snap connect opennds:hardware-observe
sudo snap connect opennds:mount-observe
sudo snap connect opennds:network-observe
sudo snap connect opennds:system-observe
After connecting these snap interfaces, the opennds daemon will start
automatically. To interact with the daemon the snap package ships
the opennds.ndsctl
command
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Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.