[Merge] ~ubuntustudio-dev/livecd-rootfs:ubuntu/master into livecd-rootfs:ubuntu/master

[Erich Eickmeyer]

Erich Eickmeyer has proposed merging ~ubuntustudio-dev/livecd-rootfs:ubuntu/master into livecd-rootfs:ubuntu/master.

Commit message:
Switch ubuntustudio to generic kernel

Requested reviews:
  Canonical Foundations Team (canonical-foundations)

For more details, see:
https://code.launchpad.net/~ubuntustudio-dev/livecd-rootfs/+git/livecd-rootfs/+merge/467727

The generic kernel will eventually undergo deprecation. Rather than wait for such a time to happen and be reactive, Ubuntu Studio would rather be proactive about this now that the generic kernel can act as a lowlatency kernel with certain command line parameters as outlined by https://discourse.ubuntu.com/t/fine-tuning-the-ubuntu-24-04-kernel-for-low-latency-throughput-and-power-efficiency/44834.

As such, we have modified our `ubuntustudio-lowlatency-settings` package, which installs `/etc/default/grub.d/ubuntustudio.cfg` with the following line:

-GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT threadirqs"
+GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT preempt=full nohz_full=all threadirqs"

Additionally, that same file used to set "GRUB_FLAVOUR_ORDER" which is no longer needed.
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