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Martin Hope
TSpark
Asked: 2020-07-31 05:25:30 +0800 CST
  • 43

I am trying to build Raspberry Pi docker images but I am always having the same error, similar to this one, this one and this one.

While running the command apt update as root in a arm32v7/ubuntu:20.04 (or just ubuntu:latest), I get the following output:

root@273d63597ce6:/# apt update
Get:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease [265 kB]
Get:2 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease [111 kB]
Get:3 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease [98.3 kB]
Get:4 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease [107 kB]
Err:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease
  At least one invalid signature was encountered.
Err:2 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease
  At least one invalid signature was encountered.
Err:3 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease
  At least one invalid signature was encountered.
Err:4 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease
  At least one invalid signature was encountered.
Reading package lists... Done
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal InRelease: At least one invalid signature was encountered.
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease: At least one invalid signature was encountered.
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease: At least one invalid signature was encountered.
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal-security InRelease: At least one invalid signature was encountered.
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal-security InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

I have tried the suggested solutions of cleaning apt, cleaning docker and removing/recreating /var/lib/apt/lists without success. The SD card is 32G and the OS is a fresh install. df shows 26G free.

Some more information:

  • This is happening on a fresh install of 2020-05-27-raspios-buster-lite-armhf on a raspberry pi 4 B
  • The same error happens on another Raspberry Pi 4 B running HypriotOS
  • The same command in the same image works fine on a raspberry pi 3 B that has Arch linux installed
  • The error does not happen if I use an older version of ubuntu (ubuntu:18.04, 16.04, 14.04)
gnupg arm docker raspberrypi 20.04
Martin Hope
l --marc l
Asked: 2019-05-15 12:41:46 +0800 CST
  • 15

How to setup of Raspberry Pi 3 B+ onboard WiFi for Ubuntu Server 18.04? In particular, with netplan?

Existing answers, such as "How to use onboard wifi on Raspberry Pi 3 with Ubuntu Server 16.04?", no longer seem to apply since /etc/network/interfaces states that netplan has replaced ifupdown.

# ifupdown has been replaced by netplan(5) on this system.  See
# /etc/netplan for current configuration.

This is a clean install of the Ubuntu Server image for Raspberry Pi 3.

##### release ###########################
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.2 LTS
Release:    18.04
Codename:   bionic

##### kernel ############################
Linux 4.15.0-1034-raspi2 #36-Ubuntu SMP PREEMPT Fri Apr 5 06:21:41 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux

According to Ubuntu Wiki RaspberryPI the needed packages should already be in place.

Since 18.04.2 the linux-firmware and linux-firmware-raspi2 packages now contain the necessary files for the built-in WiFi on the Pi 3B and 3B+.

sudo lshw -C network

*-network:0 DISABLED      
   description: Wireless interface
   physical id: 2
   logical name: wlan0
   serial: b8:27:eb:69:f2:3b
   capabilities: ethernet physical wireless
   configuration: broadcast=yes driver=brcmfmac driverversion=7.45.18 firmware=01-6a2c8ad4 multicast=yes wireless=IEEE 802.11
*-network:1
   description: Ethernet interface
   physical id: 3
   logical name: eth0
   serial: b8:27:eb:3c:a7:6e
   size: 1Gbit/s
   capacity: 1Gbit/s
   capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
   configuration: autonegotiation=on broadcast=yes driver=lan78xx driverversion=1.0.6 duplex=full ip=172.16.76.7 link=yes multicast=yes port=MII speed=1Gbit/s

Netplan.io provides some general Netplan configuration examples.

To configure netplan, save configuration files under /etc/netplan/ with a .yaml extension (e.g. /etc/netplan/config.yaml), then run sudo netplan apply.

... yet, no guideance specific to a RaspberryPi. ...in particular, with respect to the existing /etc/netplan/50-cloud-init.yaml file on the RaspberryPi Ubuntu Server install.

##### Netplan config ####################

[/etc/netplan/50-cloud-init.yaml]

# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}

network:
    version: 2
    ethernets:
        eth0:
            dhcp4: true
            match:
                macaddress: <MAC 'eth0' [IF1]>
            set-name: eth0

So, given the use of netplan and default generated .yaml file. How should one add a WiFi network SSID and password? And leave the existing wired ethernet in place?

server wireless raspberrypi 18.04 netplan
Martin Hope
David Planella
Asked: 2015-10-17 01:06:54 +0800 CST
  • 15

I've been trying snappy Ubuntu core on a Raspberry Pi 2 device, and I've heard I can use Snapcraft to do development on it. Now I hear that snaps are available on the desktop and server for Ubuntu 16.04 and other distros.

What is Snapcraft and how can I use it?

raspberrypi