[Bug 1878926] [NEW] Call trace occurred after a wrong wireless interface mistakenly applied once in the yaml

[Vic Liu]

Public bug reported:

Call trace occurred every time when running `netplan apply` after a
wrong wireless interface was once described in the yaml.

System: Intel NUC7PJYH
Image: Ubuntu Core 20 beta daily build (20200514.2)

Steps to Reproduce:
1. On this Intel NUC7PJYH I tested, its wireless interface is wlo2 instead of wlan0, I mistakenly described the wireless interface as wlan0 in the yaml at the first time, corrected it to wlo2 as far as I found the wireless connection is unreachable.

2. After the wireless interface was corrected to wlo2, following call
trace happened every time running `netplan apply`:

$ sudo netplan apply
Failed to start netplan-wpa-wlan0.service: Unit netplan-wpa-wlan0.service not found.
Traceback (most recent call last):
  File "/usr/sbin/netplan", line 23, in <module>
    netplan.main()
  File "/usr/share/netplan/netplan/cli/core.py", line 50, in main
    self.run_command()
  File "/usr/share/netplan/netplan/cli/utils.py", line 179, in run_command
    self.func()
  File "/usr/share/netplan/netplan/cli/commands/apply.py", line 46, in run
    self.run_command()
  File "/usr/share/netplan/netplan/cli/utils.py", line 179, in run_command
    self.func()
  File "/usr/share/netplan/netplan/cli/commands/apply.py", line 173, in command_apply
    utils.systemctl_networkd('start', sync=sync, extra_services=netplan_wpa)
  File "/usr/share/netplan/netplan/cli/utils.py", line 86, in systemctl_networkd
    subprocess.check_call(command)
  File "/usr/lib/python3.8/subprocess.py", line 364, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['systemctl', 'start', '--no-block', 'systemd-networkd.service', 'netplan-wpa-wlo2.service', 'netplan-wpa-wlan0.service']' returned non-zero exit status 5.

3. When a call trace happened, the wireless could still connect to the
AP without problem. When system connected to the AP described in yaml,
it still has the ability get an IP from it and ping the gateway on AP.

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1878926

Title:
  Call trace occurred after a wrong wireless interface mistakenly
  applied once in the yaml

Status in netplan.io package in Ubuntu:
  New

Bug description:
  Call trace occurred every time when running `netplan apply` after a
  wrong wireless interface was once described in the yaml.

  System: Intel NUC7PJYH
  Image: Ubuntu Core 20 beta daily build (20200514.2)

  Steps to Reproduce:
  1. On this Intel NUC7PJYH I tested, its wireless interface is wlo2 instead of wlan0, I mistakenly described the wireless interface as wlan0 in the yaml at the first time, corrected it to wlo2 as far as I found the wireless connection is unreachable.

  2. After the wireless interface was corrected to wlo2, following call
  trace happened every time running `netplan apply`:

  $ sudo netplan apply
  Failed to start netplan-wpa-wlan0.service: Unit netplan-wpa-wlan0.service not found.
  Traceback (most recent call last):
    File "/usr/sbin/netplan", line 23, in <module>
      netplan.main()
    File "/usr/share/netplan/netplan/cli/core.py", line 50, in main
      self.run_command()
    File "/usr/share/netplan/netplan/cli/utils.py", line 179, in run_command
      self.func()
    File "/usr/share/netplan/netplan/cli/commands/apply.py", line 46, in run
      self.run_command()
    File "/usr/share/netplan/netplan/cli/utils.py", line 179, in run_command
      self.func()
    File "/usr/share/netplan/netplan/cli/commands/apply.py", line 173, in command_apply
      utils.systemctl_networkd('start', sync=sync, extra_services=netplan_wpa)
    File "/usr/share/netplan/netplan/cli/utils.py", line 86, in systemctl_networkd
      subprocess.check_call(command)
    File "/usr/lib/python3.8/subprocess.py", line 364, in check_call
      raise CalledProcessError(retcode, cmd)
  subprocess.CalledProcessError: Command '['systemctl', 'start', '--no-block', 'systemd-networkd.service', 'netplan-wpa-wlo2.service', 'netplan-wpa-wlan0.service']' returned non-zero exit status 5.

  3. When a call trace happened, the wireless could still connect to the
  AP without problem. When system connected to the AP described in yaml,
  it still has the ability get an IP from it and ping the gateway on AP.

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