Try to click on the notification area in the top-right corner of your Ubuntu desktop GUI, where the various controls, battery / network etc. indicators are.
I think GNOME desktop, and thereby its derivative the standard Ubuntu desktop, has a bug on Ubuntu 24.04-LTS that prevents page-flipping, unless you click there, which somehow magically fixes the problem until the next logout + login.
Or install a different desktop GUI like KDE and see how that goes. I wouldn’t know, but assuming a GNOME bug, it would help.
The lack of financial support by the vast majority of over 99% of our users and the resulting almost catastrophic lack of funding meant that I only could spend less than 10 hours of very light touch and go testing of Ubuntu 24.04-LTS on one single loaned laptop so far, sometime in April. But I also noticed that problem immediately with the Ubuntu GUI - the only GUI installed on that machine which had AMD graphcs. Ofc. lack of funding also means there ain’t no time to fix any found bugs for the foreseeable future, and by now this bug is likely unfixable for the whole Ubuntu 24.04 cycle with GNOME anyway. I don’t think there will be time to test Ubuntu 24.04-LTS anytime soon. Right now I don’t even have one machine to test it, let alone the time. In the past, weeks or months of testing and improvement work went into making sure that Ubuntu LTS releases are top notch for neuroscience applications, not this year though.
Good luck,
-mario