minimize-manual crashes in cache.commit() when cross-building armhf images on amd64

[Łukasz Zemczak]

Ubuntu-image supports cross-building images since quite a while whenever qemu-user-static is available (it's using lb's cross-building capabilities). When building an armhf classic ubuntu-server image (preinstalled based on ubuntu-cpc) for ARCH=armhf on an amd64 host, the build fails on the `/usr/share/livecd-rootfs/minimize-manual chroot` line of auto/build. Commenting out this line makes the images build successfully.

Ubuntu-image command used for the build:
`sudo ubuntu-image classic --project ubuntu-cpc --suite disco --arch armhf --subarch raspi3 --workdir build pi3-gadget/prime/`

(after priming the pi3 classic gadget)

This results in the following Python traceback:
Traceback (most recent call last):
  File "/usr/share/livecd-rootfs/minimize-manual", line 63, in <module>
    main()
  File "/usr/share/livecd-rootfs/minimize-manual", line 59, in main
    cache.commit()
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 648, in commit
    raise SystemError("installArchives() failed")
SystemError: installArchives() failed

The same has been observed for both ubuntu-server armhf+raspi3 and vanilla armhf.

[Launchpad Janitor (janitor)]

This bug was fixed in the package livecd-rootfs - 2.624

---------------
livecd-rootfs (2.624) focal; urgency=medium

  * Mark packages as autoinstalled using apt-mark in the chroot
    instead of using python-apt that potentially starts talking to the build
    system's dbus causing various problems. (LP: #1835406)

 -- Balint Reczey <email address hidden> Wed, 13 Nov 2019 21:01:51 +0100