Upgrading node and yarn

Problem

You are getting the following error when trying to use yarn:

$ yarn
yarn install v1.21.1
[1/5] Validating package.json...
error xxxxx@: The engine "node" is incompatible with this module. Expected version "^10.0.0". Got "8.10.0"
error Found incompatible module.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

Solution

Upgrade yarn

$ curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
[sudo] password for username: 
OK

$ echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
deb https://dl.yarnpkg.com/debian/ stable main

$ sudo apt-get update
$ sudo apt-get upgrade

Which should give the updated yarn version:

$ yarn
yarn install v1.22.5
[1/5] Validating package.json...
error xxxxx@: The engine "node" is incompatible with this module. Expected version "^10.0.0". Got "8.10.0"
error Found incompatible module.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

Upgrade node version with the correct version from above (ie 10.0.0)

$ curl -fsSL https://deb.nodesource.com/setup_10.x | sudo -E bash -

$ sudo apt-get install -y nodejs
....
The following packages will be upgraded:
  nodejs
...

And then the needed versions would have been installed:

$ yarn
yarn install v1.22.5
[1/5] Validating package.json...
[2/5] Resolving packages...
success Already up-to-date.
Done in 0.90s.

Raspberry, Ubuntu and Megatools

To install megtools (command line utilities for Mega.nz), in your raspberry with ubuntu installed follow the steps below (thanks to the instructions from here: https://www.instructables.com/id/Descarga-archivos-de-Mega-con-Raspberry-Pi/)

  • Install the necessary packages
sudo apt-get -y install build-essential libglib2.0-dev libssl-dev libcurl4-openssl-dev libgirepository1.0-dev 

You may also need to add some additional packages if there is an error about the documentation.

  • Get the latest source code from https://megatools.megous.com
wget https://megatools.megous.com/builds/megatools-1.10.3.tar.gz
  • Compile and install them
tar xvfz megatools-1.10.3.tar.gz
cd megatools-1.10.3
./configure
make
sudo make install
sudo ldconfig
  • Add your Mega account credentials in ~/.megarc like:
[Login]
Username = my_mega@email
Password = mypassword
  • use the mega tools commands (megacopy, megals, megaget etc.

Erlang and Elixir with asdf in Raspberry 4 with Ubuntu 20.04

To install the latest/current versions of erlang (23.0.2) and elixir (1.10.3), follow the instructions below:

Install asdf ( full instructions https://asdf-vm.com/#/core-manage-asdf-vm):

git clone https://github.com/asdf-vm/asdf.git ~/.asdf --branch v0.7.8

Add the following two lines in your ~/.bashrc file:

# Add asdf version manager 
. $HOME/.asdf/asdf.sh
. $HOME/.asdf/completions/asdf.bash

Reload/Source your bash file with

source ~/.bashrc

Install the erlang plugin

asdf plugin add erlang

If you get the following warnings:

...
Extracting source code
Building Erlang/OTP 23.0.2 (asdf_23.0.2), please wait...
WARNING: It appears that a required development package 'libssl-dev' is not installed.
WARNING: It appears that a required development package 'automake' is not installed.
WARNING: It appears that a required development package 'autoconf' is not installed.
WARNING: It appears that a required development package 'libncurses5-dev' is not installed.
Configure failed.
...

Install the missing packages:

sudo apt install libssl-dev automake autoconf libncurses5-dev

Install latest erlang version:

asdf install erlang latest
...
Erlang/OTP 23.0.2 (asdf_23.0.2) has been successfully built
...

Set it up globally (if you want):

asdf global erlang 23.0.2

Add elixir plugin:

asdf plugin add elixir

Install latest elixir version (1.10.3):

asdf install elixir latest

Set it up globally:

asdf global elixir 1.10.3-otp-23

Finally you can also install the latest Phoenix version (1.5.3):

mix archive.install hex phx_new 1.5.3

WiFi, Raspberry Pi 4 B, Ubuntu 20.04

After installing an image of the Ubuntu server on the Raspberry 4, the wifi is not automatically configured after the initial book.

In order to be able to use the WiFi follow the steps described below for setting up your wifi in your SD card, and then reboot your raspberry (make sure that the indentation in the yaml file is correct, and also your WiFi access point is enclosed in quotes):

https://ubuntu.com/tutorials/how-to-install-ubuntu-on-your-raspberry-pi#3-wifi-or-ethernet

Errors were encountered while processing: linux-image-3.13.0-128-generic

Problem

You are trying to install/remove a package but you always get an error message about linux message as above:

Errors were encountered while processing:
 linux-image-3.13.0-128-generic

Solution

Try the following:

rm -rf /var/lib/dpkg/info/linux-image-3.13.0-128-generic.*
apt-get purge linux-image-3.13.0-128-generic

Docker – Debian – Kernel panick – Automatic restart

Problem

You have a remote server (Debian) running some Docker containers and you want to make sure that they all restart in the event of a kernel panick.

solution

  • Add an automatic restart after a kernel panick by running:
    sysctl kernel.panic=20
  • Emulate a kernel panick by running the following (SysRq more info here :
    echo c > /proc/sysrq-trigger
  • Check that the containers have restarted again with docker ps (NOTE: the containers should have been enabled to autorestart)