gvenic instances seem to have an mtu of 1460 by default. If you `lxd
init --auto` and then `ip link set mtu 1460 lxdbr0`, then the launched
containers should work. I think lxd init should account for the fact
that not all interfaces are 1500 by default.

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https://bugs.launchpad.net/bugs/2073620

Title:
  http timeout from lxd container using n4-highcpu-2 gce instances

Status in linux-gcp package in Ubuntu:
  New

Bug description:
  When I start a n4-highcpu-2 instance in gce, I see that from an lxd
  container the command `apt update` returns in a timeout.

  This is reproduced just on n4-highcpu-2 (used us-east1-b) instances
  with different lxd versions (tried latest/stable and 5.3.x).

  steps to reproduce:

  $ snap install lxd --channel latest/stable
  $ lxd init --auto
  $ lxd.lxc launch ubuntu:noble
  $ lxd.lxc exec moved-chipmunk -- apt update
     0% [Waiting for headers] [Waiting for headers]

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