Xubuntu 26.04, with the XFCE Desktop Environment, still uses X11. So if you want to run Ardour in native X11 and aren’t vehemently opposed to switching your DE, that’s an alternative to sticking to 24.04.
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Thank you @peder for the comment, it’s helpful to fill out my picture of 26.04 overall. My understanding is that while Ubuntu Studio 26.04 LTS will use KDE + Wayland by default, it will be possible to manually install X11 and use it natively. I won’t upgrade until I’m convinced that’s true.
As far as XFCE is concerned, I used it daily as a contract engineer designing chips for a big company, and it was fine. But at this point I’m kind of married to KDE (see user name).
Thanks again, appreciate it.
Probably not related to your issue at all, but Ubuntu LTS does tend to stay with older packages, including QT as well as many other things (pipewire comes to mind). While it does include Qt6 it uses an older version, v6.6. Qt is already at v6.11 but their policy does not allow for upgrading even for POINT releases apparently and this has been an issue for one of my projects. There was a change between Qt6.6 and Qt6.7 which breaks a lot of stuff and the Ubuntu/Kubuntu project refuses to address it. I can understand not upgrading Qt6 to Qt7 on a LTS release, but for a point release, this is beyond ridiculous.
Fortunately for my project (FreeFactoryQT), I was able to create a compat script to make it work with Qt6.6 but it took me two weeks to figure it out.