I installed 8.1 manually on an ubuntu studio system. The version 6 of Ardour that came with ubuntu studio looks to still be installed as well, which I hope won’t hurt anything.
Near as I can tell 8.1 is running great. But the little application menu at the top of my screen seems to think the running version is 6. Is this a sign of anything to be concerned about?
By “manually” do you mean you executed the Ardour-8.1.0-x86_64.run file that you downloaded from the Ardour web site?
Just making sure you are not talking about compiling from source and trying to copy over files by hand.
Check the “About” windows from the Help menu to make sure you did not start Ardour6 by mistake when intending to start Ardour8. If you used some kind of desktop icon or shortcut it may have been referencing the system installed version.