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sudo sed -i -re 's/([a-z]{2}\.)?archive.ubuntu.com|security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list
sudo apt-get update && sudo apt-get dist-upgrade

See:

• https://askubuntu.com/questions/91815/how-to-install-software-or-upgrade-from-an-old-unsupported-release
• https://wiki.ubuntu.com/Releases

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WSL

Generating key pair

ssh-keygen -t ed25519 -C "[email protected]"

See gitub.com: Generating a new SSH key and adding it to the ssh-agent:

Key/pub will be here ~\.ssh and will look like id_ed25519 and id_ed25519.pub

(optional) Run SSH agent on Windows startup using Task Scheduler (taskschd.msc)

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How to remove the Win10's PATH from WSL Create or edit /etc/wsl.conf

 [interop]
 enabled=false # enable launch of Windows binaries; default is true
 appendWindowsPath=false # append Windows path to $PATH variable; default is true

then wsl --shutdown

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docker run -it -v $(pwd):/home/docker -v /var/run/docker.sock:/var/run/docker.sock -w /home/docker docker:19.03.8 /bin/sh

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IN_CERTS=$(cat in.pem)
echo -e "$IN_CERTS" > ./tmp.pem 
sed -i '/^[[:space:]]*$/d' ./tmp.pem
mkdir -p _certs 
csplit -s -z -f './_certs/cert-' -b '%02d.crt' ./tmp.pem '/-----BEGIN CERTIFICATE-----/' '{*}'

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find . -name "*.sh" -exec git ls-files -s {} \;
find . -name "*.sh" -exec git update-index --chmod=+x {} \;

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VcXsrv

Install VcXsrv on Windows. Launch X Server with the settings: Display number: 0, Disable access control: yes

Test

# DISPLAY in WSL
export DISPLAY=$(cat /etc/resolv.conf | grep nameserver | awk '{print $2}'):0

#check
apt install x11-apps

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How to check that CA certificate is untrasted under WSL2 (Ubuntu) and fix it

1. Check that certificate is untrusted under WSL2

   HOST=abc.foo.cloud # or another
   openssl s_client -connect ${HOST}:443 -showcerts
   

   Result:

     CONNECTED(00000003)
   

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cat | tee -a ~/.bashrc > /dev/null << "EOF"

# supported cases: 
#   git config user.email
#   git clone https://aaa.git bbb && ls -al ~/.gitconfig
#   git clone https://aaa.git aaa
#   git checkout -b test
#   git commit  -am 'issue-42"s '
#   git commit  -am "issue-42's "

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package aaa;

import com.google.common.util.concurrent.Uninterruptibles;
import io.vertx.core.Vertx;
import io.vertx.core.http.*;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.*;