I tested LXD and lxc for #1934187.

** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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https://bugs.launchpad.net/bugs/1934187

Title:
  lxd exec fails

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Focal:
  Fix Committed

Bug description:
  [Impact]
  lxd will not work, as lxc exec is not able to set the apparmor confinement 
and bails out executing inside the container.

  [Fix]
  Revert upstream commit bfb819ea20ce8bbeeba17e1a6418bf8bda91fc28 ("proc: Check 
/proc/$pid/attr/ writes against file opener").

  [Test case]
  lxd basic usage test suite was run.
  On a 4.15 kernel, the whole lxd autopkgtest was run.

  [Potential regression]
  Unprivileged use of PID attributes may be permitted when they shouldn't.

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