Public bug reported:

I cannot get a bash shell into a focal container on my bionic host.
stdout shows TIOCGPTPEER unavailable message.
`lxc ls` shows it is running, and I can ping it's IP address.

$ lxc exec focal-NOTREAL -- bash
Error: TIOCGPTPEER required but not available
$ uname -a
Linux timbre 4.4.0-164-generic #192-Ubuntu SMP Fri Sep 13 12:02:50 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux
$ uname -a
Linux timbre 4.4.0-164-generic #192-Ubuntu SMP Fri Sep 13 12:02:50 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux
$ lxc config show focal-NOTREAL
architecture: x86_64
config:
  image.architecture: amd64
  image.description: ubuntu 20.04 LTS amd64 (release) (20201014)
  image.label: release
  image.os: ubuntu
  image.release: focal
  image.serial: "20201014"
  image.type: squashfs
  image.version: "20.04"
  volatile.base_image: 
e81943d409153d0962e3855b7d9e6c60640571529f47b16eec2da5b4f2ad77ff
  volatile.eth0.host_name: veth0ad5a93b
  volatile.eth0.hwaddr: 00:16:3e:72:ed:8d
  volatile.idmap.base: "0"
  volatile.idmap.current: 
'[{"Isuid":true,"Isgid":false,"Hostid":1000000,"Nsid":0,"Maprange":1000000000},{"Isuid":false,"Isgid":true,"Hostid":1000000,"Nsid":0,"Maprange":1000000000}]'
  volatile.idmap.next: 
'[{"Isuid":true,"Isgid":false,"Hostid":1000000,"Nsid":0,"Maprange":1000000000},{"Isuid":false,"Isgid":true,"Hostid":1000000,"Nsid":0,"Maprange":1000000000}]'
  volatile.last_state.idmap: 
'[{"Isuid":true,"Isgid":false,"Hostid":1000000,"Nsid":0,"Maprange":1000000000},{"Isuid":false,"Isgid":true,"Hostid":1000000,"Nsid":0,"Maprange":1000000000}]'
  volatile.last_state.power: RUNNING
devices: {}
ephemeral: false
profiles:
- default
stateful: false
description: ""

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1901611

Title:
  can't launch focal container on bionic (TIOCGPTPEER)

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