CPC are seeing this issue in _all_ minimal cloud images testing with LXD
snap version 4.2 or greater. This blocks promotion of all minimal cloud
download images and blocks build and publication of both daily and
release cloud images.

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https://bugs.launchpad.net/bugs/1882955

Title:
  LXD 4.2 broken on linux-kvm due to missing VLAN filtering

Status in linux-kvm package in Ubuntu:
  Triaged

Bug description:
  This is another case of linux-kvm having unexplained differences
  compared to linux-generic in areas that aren't related to hardware
  drivers (see other bug we filed for missing nft).

  This time, CPC is reporting that LXD no longer works on linux-kvm as
  we now set vlan filtering on our bridges to prevent containers from
  escaping firewalling through custom vlan tags.

  This relies on CONFIG_BRIDGE_VLAN_FILTERING which is a built-in on the
  generic kernel but is apparently missing on linux-kvm (I don't have
  any system running that kernel to confirm its config, but the behavior
  certainly matches that).

  We need this fixed in focal and groovy.

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