[Bug 2119012] Re: Ubuntu Studio CD image build failure

[Dan Bungert]

What's going on with questing?  ISO builds pass there for instance,
where I would expect similar changes to be needed.

Uploaded livecd-rootfs for noble.  As Michael noted, this bug should be
updated for the SRU template.

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https://bugs.launchpad.net/bugs/2119012

Title:
  Ubuntu Studio CD image build failure

Status in livecd-rootfs package in Ubuntu:
  In Progress
Status in lowlatency-kernel package in Ubuntu:
  New
Status in livecd-rootfs source package in Noble:
  In Progress
Status in lowlatency-kernel source package in Noble:
  New
Status in livecd-rootfs source package in Plucky:
  Won't Fix
Status in lowlatency-kernel source package in Plucky:
  New
Status in livecd-rootfs source package in Questing:
  In Progress
Status in lowlatency-kernel source package in Questing:
  New

Bug description:
  Ubuntu Studio uses the lowlatency kernel. With 6.14, the lowlatency
  kernel is just the generic kernel with some bootargs to make it
  lowlatency. This breaks the Ubuntu Studio livefs and CD image builds.

  https://launchpad.net/~ubuntu-
  cdimage/+livefs/ubuntu/noble/ubuntustudio

  Problem 1)

  The postinst hook of the lowlatency-kernel package calls update-grub
  unconditionally which fails if the package is installed in a chroot.

  From a livefs build log:

  Processing triggers for dbus (1.14.10-4ubuntu4.1) ...
  Processing triggers for libgtk-3-0t64:amd64 (3.24.41-4ubuntu1.3) ...
  Processing triggers for shared-mime-info (2.4-4) ...
  Processing triggers for libgtk2.0-0t64:amd64 (2.24.33-4ubuntu1.1) ...
  Processing triggers for desktop-file-utils (0.27-2build1) ...
  Processing triggers for initramfs-tools (0.142ubuntu25.5) ...
  Processing triggers for hicolor-icon-theme (0.17-2) ...
  Processing triggers for libc-bin (2.39-0ubuntu8.5) ...
  Processing triggers for man-db (2.12.0-4build2) ...
  Processing triggers for dictionaries-common (1.29.7) ...
  Processing triggers for linux-image-6.14.0-24-generic (6.14.0-24.24~24.04.3) ...
  /etc/kernel/postinst.d/initramfs-tools:
  update-initramfs: Generating /boot/initrd.img-6.14.0-24-generic
  cryptsetup: ERROR: Couldn't resolve device overlay
  cryptsetup: WARNING: Couldn't determine root device
  cryptsetup: ERROR: Couldn't resolve device /dev/vdb
  Errors were encountered while processing:
   lowlatency-kernel

  Problem 2)

  The kernel flavor name changed from 'lowlatency' to 'generic'. This
  breaks livecd-rootfs.

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