2021-01-31 04:58:46 edcepp

HW
  Turtlebot3 Burger
  Raspberry Pi 3
SW
  Ubuntu 18.04
  ROS 2 Dashing
 

Install Procedure 

The setup instructions are documented in Section 3.2 "SBC Setup" of the Turtlebot3 eManual

  https://emanual.robotis.com/docs/en/platform/turtlebot3/sbc_setup/#sbc-setup

* Section 3.2.1 installs the Ubuntu 19.04 on the micro SD card
* Section 3.2.2 boots up the RPi
* Section 3.2.3 configures the Wifi on the RPi and installs ssh
* Section 3.2.4 adds swap space
* ssh works fine with wlan0 and eht0
* Section 3.2.5 installs ROS 2 Dashing Base
** Step 2a: sudo apt update followed by a reboot does not break wlan0
** Step 2b: sudo apt upgrade followed by a reboot leaves wlan0 inoperable. See attached image. The wlan0 boot message from the screen capture is. It times out after 90 seconds and continues to boot.

 
  [    **] A start job is running for sys-subsystem-net-devices-wlan0.device (1min 26s / 1min 30s)_ 

My Resolution

wlan0 works fine if I skip the upgrade step and go on to install ROS 2.

Questions

What are the ramifications of skipping the upgrade?
Is there a better resolution than skipping upgrade? 

Tests

I do not know enough about the networking subsystem to effectively debug the system. I did the following random tests with confirmed a problem with wlan0. I don't know if and how to use this information. Apologies. 

ls /sys/class/net

       eth0  lo

$ sudo netplan --debug apply
** (generate:5701): DEBUG: 18:10:24.479: Processing input file /etc/netplan/50-cloud-init.yaml..
** (generate:5701): DEBUG: 18:10:24.480: starting new processing pass
** (generate:5701): DEBUG: 18:10:24.481: wlan0: adding wifi AP 'zdome'
** (generate:5701): DEBUG: 18:10:24.481: We have some netdefs, pass them through a final round of validation
** (generate:5701): DEBUG: 18:10:24.481: wlan0: setting default backend to 1
** (generate:5701): DEBUG: 18:10:24.481: Configuration is valid
** (generate:5701): DEBUG: 18:10:24.481: eth0: setting default backend to 1
** (generate:5701): DEBUG: 18:10:24.481: Configuration is valid
** (generate:5701): DEBUG: 18:10:24.482: Generating output files..
** (generate:5701): DEBUG: 18:10:24.482: NetworkManager: definition eth0 is not for us (backend 1)
** (generate:5701): DEBUG: 18:10:24.482: Creating wpa_supplicant config
** (generate:5701): DEBUG: 18:10:24.482: wlan0: Creating wpa_supplicant configuration file run/netplan/wpa-wlan0.conf
** (generate:5701): DEBUG: 18:10:24.482: Creating wpa_supplicant unit /run/systemd/system/netplan-wpa-wlan0.service
** (generate:5701): DEBUG: 18:10:24.492: Creating wpa_supplicant service enablement link /run/systemd/system/systemd-networkd.service.wants/netplan-wpa-wlan0.service
** (generate:5701): DEBUG: 18:10:24.493: NetworkManager: definition wlan0 is not for us (backend 1)
DEBUG:netplan generated networkd configuration changed, restarting networkd
DEBUG:no netplan generated NM configuration exists
DEBUG:eth0 not found in {}
DEBUG:wlan0 not found in {}
DEBUG:Merged config:
network:
  bonds: {}
  bridges: {}
  ethernets:
    eth0:
      dhcp4: true
      dhcp6: true
      optional: true
  vlans: {}
  wifis:
    wlan0:
      access-points:
        xxx:
          password: yyy
      dhcp4: true
      dhcp6: true

DEBUG:Skipping non-physical interface: lo
DEBUG:device eth0 operstate is up, not changing
DEBUG:{}
DEBUG:netplan triggering .link rules for lo
DEBUG:netplan triggering .link rules for eth0
Warning: The unit file, sourcesudo netplan --debug apply configuration file or drop-ins of netplan-wpa-wlan0.service changed on disk. Run 'systemctl daemon-reload' to reload units.

 

$ systemctl daemon-reload
       ==== AUTHENTICATING FOR org.freedesktop.systemd1.reload-daemon ===
       Authentication is required to reload the systemd state.
       Authenticating as: Ubuntu (ubuntu)
       Password:
       ==== AUTHENTICATION COMPLETE ===

$ sudo netplan apply
       Warning: The unit file, source configuration file or drop-ins of netplan-wpa-wlan0.service changed on disk. Run 'systemctl daemon-reload' to reload units.
       Warning: The unit file, source configuration file or drop-ins of netplan-wpa-wlan0.service changed on disk. Run 'systemctl daemon-reload' to reload units.

$ sudo netplan generate

$ sudo netplan apply
       Warning: The unit file, source configuration file or drop-ins of netplan-wpa-wlan0.service changed on disk. Run 'systemctl daemon-reload' to reload units.
 
$ systemctl daemon-reload
       ==== AUTHENTICATING FOR org.freedesktop.systemd1.reload-daemon ===
       Authentication is required to reload the systemd state.
       Authenticating as: Ubuntu (ubuntu)
       Password:
       ==== AUTHENTICATION COMPLETE ===

$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether b8:27:eb:0b:5d:ce brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.186/24 brd 10.0.0.255 scope global dynamic eth0
       valid_lft 78973sec preferred_lft 78973sec
    inet6 fe80::ba27:ebff:fe0b:5dce/64 scope link
       valid_lft forever preferred_lft forever

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