Download the Linux nstaller (.run file) - I recommend you copy the link from the IA download page and paste it in place of the version-redacted link below: wget --referer=https://inductiveautomation.com/downloads/ignition https://files.inductiveautomation.com/release/ia/8.1.xx/yyyyyyyy/ignition-8.1.xx-linux-x64-installer.run
Make the file executable (w/ chmod command referenced in that doc). chmod +x ./ignition-8.1.xx-linux-64-installer.run
Then run the installer. ./ignition-8.1.xx-linux-64-installer.run
You may need super-user permissions (add sudo to beginning of your commands).