20.04 Focal armhf cloud-images failing to build due to running out of space

[John Chittum]

[Justification]
breaks cloud builds on armhf in focal due to changes of size of packages in the archive.

[Test plan]
Do a -proposed build of CPC images on armhf. If it succeeds, we're good.

[Where problems could occur]
Increased size of images could cause downstream problems for consumers. However, linux-firmware is not getting smaller, and images in later series already have this new size. Downstream consumers will need to adapt.

[Original report]

from the build:

Preparing to unpack .../libfreetype6_2.10.1-2ubuntu0.2_armhf.deb ...
Unpacking libfreetype6:armhf (2.10.1-2ubuntu0.2) ...
Selecting previously unselected package grub-common.
Preparing to unpack .../grub-common_2.04-1ubuntu26.16_armhf.deb ...
Unpacking grub-common (2.04-1ubuntu26.16) ...
dpkg: error processing archive /var/cache/apt/archives/grub-common_2.04-1ubuntu26.16_armhf.deb (--unpack):
 cannot copy extracted data for './usr/share/grub/unicode.pf2' to '/usr/share/grub/unicode.pf2.dpkg-new': failed to write (No space left on device)
No apport report written because the error message indicates a disk full error
dpkg-deb: error: paste subprocess was killed by signal (Broken pipe)
Selecting previously unselected package grub2-common.
Preparing to unpack .../grub2-common_2.04-1ubuntu26.16_armhf.deb ...
Unpacking grub2-common (2.04-1ubuntu26.16) ...
Selecting previously unselected package grub-efi-arm-bin.
Preparing to unpack .../grub-efi-arm-bin_2.04-1ubuntu26.16_armhf.deb ...
Unpacking grub-efi-arm-bin (2.04-1ubuntu26.16) ...
Selecting previously unselected package grub-efi-arm.
Preparing to unpack .../grub-efi-arm_2.04-1ubuntu26.16_armhf.deb ...
Unpacking grub-efi-arm (2.04-1ubuntu26.16) ...
Errors were encountered while processing:
 /var/cache/apt/archives/grub-common_2.04-1ubuntu26.16_armhf.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

this started in or around February 15th

[John Chittum (jchittum)]

added `livecd-rootfs` as the image size is set there.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.