I wrote this post in English because of my intension to send it to wiki.js' channel to reply to others' questions.
The operations below were done in Ubuntu Server 22.04 amd64

Set up the environment

1. Update system dependencies

   sudo apt update && sudo apt upgrade -y

2. Install Node.js 18.x and yarn
   If Node 18.x was already installed in your instance, please skip the step.
   To install it directy, head to https://nodejs.org/en/download/. I'll set up nvm here and then use it to set up the node environment.

   curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash
   # restart terminal
   nvm install node # install latest node
   npm install --global yarn

3. Install PostgreSQL 14.x
   If postgresql was already installed on your instance, please skip this step.

   sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
   wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
   sudo apt-get update
   sudo apt-get -y install postgresql

4. Set up PostgreSQL database

   sudo -u postgres psql
   CREATE USER wikijs WITH PASSWORD 'wikijsrocks';
   CREATE DATABASE wiki OWNER wikijs;
   GRANT ALL PRIVILEGES ON DATABASE wiki TO wikijs;
   \q

Set up Wiki.js

5. Clone Wiki.js' repo and do setup

   cd /your/desired/directory
   git clone https://github.com/requarks/wiki.git
   cd wiki
   git checkout vega
   yarn install
   cd ux
   yarn install
   npm run build #build assets
   cd ..
   cp config.sample.yml config.yml
   npm run start

Try out

6. Access wiki js at localhost:3000 or <your instance's local ip>:3000
   You can try the below url:
   Login Panel: /login
   Admin Panel: /_admin/
   Profile Panel: /_profile