[Bug 2033496] Re: [canary] fails to install on BIOS system: dpkg-query: package 'grub-pc' is not installed

[Jean-Baptiste Lallement]

Installation fails with latest subiquity from u-d-i 1219 in candidate
and image 20230831

** Attachment added: "installer.tgz"
   https://bugs.launchpad.net/ubuntu-desktop-installer/+bug/2033496/+attachment/5696783/+files/installer.tgz

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Title:
  [canary] fails to install on BIOS system: dpkg-query: package 'grub-
  pc' is not installed

Status in curtin:
  Fix Released
Status in ubuntu-desktop-installer:
  New
Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  Canary Mantic 20230830

  Installation in VM, BIOS, with network

  Installation fails with
  ```
        curtin.util.ProcessExecutionError: Unexpected error while running command.
          Command: ['unshare', '--fork', '--pid', '--', 'chroot', '/target', 'dpkg-reconfigure', 'grub-pc']
          Exit code: 1
          Reason: -
          Stdout: ''
          Stderr: dpkg-query: package 'grub-pc' is not installed and no information is available
                  Use dpkg --info (= dpkg-deb --info) to examine archive files.
                  /usr/sbin/dpkg-reconfigure: grub-pc is not installed
  ```

  Installation is successful on UEFI.

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