[Bug 1981109] Re: server image pulls in ModemManager via fwupd, consumes 25MiB RAM in every container

[Steve Langasek]

fwupd it happens pulls in not only ModemManager but also udisks2, so
there are two daemons running in every container as a result of fwupd's
presence.

Having discussed with the CPC team, it doesn't make sense to include
fwupd in any cloud or container images, unless there's a particular
partner image that's used on baremetal and exposes devices for firmware
updates.

So since fwupd is only a recommends of ubuntu-server, we can and should
just remove this package during the image build.

Leaving the ubuntu-meta task open because we probably do want to
refactor the seeds so that such removals are not necessary during the
image build.

** Also affects: livecd-rootfs (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: livecd-rootfs (Ubuntu)
   Importance: Undecided => High

** Changed in: livecd-rootfs (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1981109

Title:
  server image pulls in ModemManager via fwupd, consumes 25MiB RAM in
  every container

Status in fwupd package in Ubuntu:
  Invalid
Status in livecd-rootfs package in Ubuntu:
  Triaged
Status in modemmanager package in Ubuntu:
  Triaged
Status in ubuntu-meta package in Ubuntu:
  New

Bug description:
  Looking at memory utilization in a pristine Ubuntu lxd container (top
  -o RES), I see that ModemManager is running, which I was surprised to
  see is present at all in the stock image.

  Tracking this I find that fwupd depends on libmm-glib0, which in turn
  Recommends: modemmanager.

  Libraries in general should not recommend daemons, so it's possible
  this should be fixed by libmm-glib0 dropping this Recommends.  It
  certainly doesn't seem to be a deliberate decision by the Server Team
  to have modemmanager installed and running by default on all systems.

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