Comment 3 for bug 1960592

Thank you all for your help.

    $ apt-cache policy qemu gcc-powerpc64-linux-gnu
    qemu:
      Installed: (none)
      Candidate: 1:6.0+dfsg-2expubuntu1.1
      Version table:
         1:6.0+dfsg-2expubuntu1.1 500
            500 http://de.ports.ubuntu.com/ubuntu-ports impish-updates/universe ppc64el Packages
         1:6.0+dfsg-2expubuntu1 500
            500 http://de.ports.ubuntu.com/ubuntu-ports impish/universe ppc64el Packages
    N: Unable to locate package gcc-powerpc64-linux-gnu

But:

    $ apt-cache policy gcc-powerpc-linux-gnu
    gcc-powerpc-linux-gnu:
      Installed: (none)
      Candidate: 4:11.2.0-1ubuntu1
      Version table:
         4:11.2.0-1ubuntu1 500
            500 http://de.ports.ubuntu.com/ubuntu-ports impish/universe ppc64el Packages

Thank you for telling me about `--arch-only`. That seems to be it.

    $ sudo eatmydata apt --arch-only build-dep qemu
    Reading package lists... Done
    Reading package lists... Done
    Building dependency tree... Done
    Reading state information... Done
    0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

As I had manually installed the dependencies before, nothing happened as expected.