The lowlatency 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.
unminimize is currently present at /usr/local/sbin/unminimize,
which is spit out by livecd-rootfs currently. We'd like to switch
that to use the packaged unminimize, which will be at
/usr/bin/unminimize instead.
There was a change made by me in https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/466388
as part of LP: #2066905 to remove references to LXD in the unminimize scripts
but I also removed the calls to `unminimize` in error.
This still needs to run but without any references to LXD which no longer
needs to be `unminimized` via snap installation.
The ubuntu-core-installer image is an installer that installs ubuntu
core. The environment the installer runs in is similar to the server
installer but it has a source catalog entry that points to the model
created in ubuntu-core-installer/hooks/05-prepare-image.binary, which
subiquity knows how to install.
With current kernel we need to specify the SBI driver
for the early console to work.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
fix: No longer install LXD snap in unminimize script (LP: #2066905)
The LXD snap is no longer seeded in any images since Noble+ so the LXD related unminimize logic in
./live-build/auto/build?h=ubuntu/noble and ./live-build/ubuntu-server/hooks/01-unminimize.chroot_early
is no longer required.
lxd-installer can remain installed.
MP: https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/466316
The LXD snap is no longer seeded in any images since Noble+ so the LXD related unminimize logic in
./live-build/auto/build?h=ubuntu/noble and ./live-build/ubuntu-server/hooks/01-unminimize.chroot_early
is no longer required.
lxd-installer can remain installed.
fix(HyperV desktop): Re-enable ability to build HyperV desktop images (LP: #2064280)
We have not built Hyperv desktop images since Jammy and with the re-introduction of HyperV for Noble we have encountered build issues caused by refactoring and removals of code assumed to be redundant but the HyperV desktop images were actually using these code paths.
In bbedffe6 we split the building of cloud images and non cloud to using an ddisk-image-uefi.binary and disk-image-uefi-non-cloud.binary respectively. In e38264ca there was a change which meant that any attempt to build hyperv images would result in incorrect disk size and incorrect disk label.
This has been fixed by ensuring that the ubuntu:desktop-preinstalled $PROJECT:$SUBPROJECT matches and sets the correct disk size and correct disk label.
A change in 76d79466 changed the logic of how the image size for amd64 images were being set. This overrode the sizes set for the desktop images incorrectly.
This MP ensures that hyperv desktop images can now be built and successfully launched with hyperv manager.
MP: https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/465288
For Ubuntu 24.04 and later cloud-init is included in desktop images. This is not applicable for Hyperv images so
we can disable cloud-init. This leaves the cloud-init package installed but disabled so users can still
use it if they want.
This is a documented way to disable cloud-init. See https://cloudinit.readthedocs.io/en/latest/howto/disable_cloud_init.html
A change in 8fb21808 also removed many of the dependencies that the hyperv images require.
This removal has been restored in this commit by adding them expliciltly in the hyperv hook.
We have not built Hyperv desktop images since Jammy and with the re-introduction of HyperV for Noble we have encountered build issues caused by refactoring and removals of code assumed to be redundant but the HyperV desktop images were actually using these code paths.
In bbedffe6 we split the building of cloud images and non cloud to using an ddisk-image-uefi.binary and disk-image-uefi-non-cloud.binary respectively. In e38264ca there was a change which meant that any attempt to build hyperv images would result in incorrect disk size and incorrect disk label.
This has been fixed by ensuring that the ubuntu:desktop-preinstalled $PROJECT:$SUBPROJECT matches and sets the correct disk size and correct disk label.
A change in 76d79466 changed the logic of how the image size for amd64 images were being set. This overrode the sizes set for the desktop images incorrectly.
This commit ensures that any desktop image being created uses the correct image size.
Łukasz 'sil2100' Zemczak
Zhai Zhaoxuan
Erich Eickmeyer
Utkarsh Gupta
Philip Roche
Michael Hudson-Doyle
Brian Murray
Heinrich Schuchardt
Dan Bungert
Julian Andres Klode