[Bug 1187693] Re: Disables auto-upping due to `[ifupdown] managed=true` even if network-manager is not installed

[Robie Basak]

Thanks! Am I missing some documentation of this behaviour somewhere, or
is it really only documented in the code and in a printed warning on
execution? It seems to me that it is essential that this should be
documented, because it's an interaction that one wouldn't expect. Is
this a separate bug?

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https://bugs.launchpad.net/bugs/1187693

Title:
  Disables auto-upping due to `[ifupdown] managed=true` even if network-
  manager is not installed

Status in “ifupdown” package in Ubuntu:
  New

Bug description:
  If the network-manager package has been removed but not purged and
  /etc/NetworkManager/NetworkManager.conf contains

      [ifupdown]
      managed=true

  then ifup still refrains from bringing up interfaces automatically.

  This has already confused at least one person.

      http://askubuntu.com/questions/302840/etc-network-interfaces-
  ignored/304291

  It might be better if ifup refrained from bringing up "auto"
  interfaces only if network-manager is installed.

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