Hello @Damian_Kozlowski,
Thanks for contacting support, I’d be happy to take a look over this issue with you. Can you please provide an overview of your setup using this link as a guide?
We would need to know the make/model of your DAC and Core system specs specifically what device is hosting your Ubuntu Roon integration, is it a NUC or some other kind of setup?
Can you please provide a screenshot of what happens when the buffer size page is showing up for you?
Can you also please confirm that you have updated your Roon version to the newest one we have available? You can check this in Settings -> About (on the top right-hand corner of the settings window), the newest one we have should be version 1.5 b323. Please let me know the above information when possible.
Thanks,
Noris