Install cmake from software.
Open a terminal and run sudo apt-get install build-essential
Then run sudo apt install git
close terminal
Download and install the SDRplay API from here: SDRPlay 3.07.1
Open a terminal and install these packages.
sudo apt-get install libsoapysdr0.7
sudo apt-get install libsoapysdr-dev
sudo apt-get install soapysdr-tools
Build and install the SoapySDRPlay module following the instructions here: SoapySDRPlay3
Open file explorer and navigate to /etc/modprobe.d/blacklist.conf
Open a terminal and run sudo gedit this will open text editor as root.
Drag and drop the blacklist.conf file into the text editor and add these lines at the bottom and click save,
blacklist sdr_msi3101
blacklist msi001
blacklist msi2500
Plug your SDRPlay device in and make sure the SoapySDRPlay installation is working by following the instructions here: SoapySDRUtil
Download and install the OpenWebRX package for Ubuntu following the instructions from here: install openwebrx
Run commands in terminal as root 'sudo -i'
Open your browser at localhost:8073 and cllick on settings and set your device up.
Useful commands:
Stop/Start/Restart openwebrx server,
sudo systemctl restart openwebrx
sudo systemctl stop openwebrx
Stop/Start SDRPlay API,
sudo systemctl start sdrplay
sudo systemctl stop sdrplay
Sample settings for SDRPlay RSP1A in screenshots.