diff --git a/README.md b/README.md
index a144d3d..5c54276 100644
--- a/README.md
+++ b/README.md
@@ -56,63 +56,6 @@ $ wget http://gitlab.tp.rulingcom.com/erictyl/install_r45_on_ubuntu_1804lts_doc/
 $ bash install_nginx.sh
 $ sudo wget http://gitlab.tp.rulingcom.com/erictyl/install_r45_on_ubuntu_1804lts_doc/-/raw/master/orbit_nginx -O /etc/nginx/orbit_sites/xxx_ooo # 建立網站 nginx 設定檔，xxx 為學校縮寫，ooo 為系所、單位縮寫。內容參考附註 nginx 設定檔
 ```
-## 安裝 MongoDB 3.2.22
-```sh
-$ # 匯入 MongoDB 公鑰到套件管理系統
-$ wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl1.0/libssl1.0.0_1.0.2n-1ubuntu5.6_amd64.deb  #Ubuntu 20.04LTS
-$ sudo dpkg -i libssl1.0.0_1.0.2n-1ubuntu5.6_amd64.deb  #Ubuntu 20.04LTS
-$ wget -qO - https://www.mongodb.org/static/pgp/server-3.2.asc | sudo apt-key add -
-$ # 建立 list file
-$ echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list
-$ sudo apt-get update # 更新套件管理系統
-$ # 下載並安裝 MongoDB 3.2.22
-$ sudo apt-get install -y mongodb-org=3.2.22 mongodb-org-server=3.2.22 mongodb-org-shell=3.2.22 mongodb-org-mongos=3.2.22 mongodb-org-tools=3.2.22
-$ mongo --version # 查看 MongoDB 版本
-$ sudo systemctl status mongod # 查看 MongoDB 是否啟動
-$ sudo systemctl restart mongod # 安全啟動 MongoDB，若已啟動則可跳過此步驟
-```
-
-## 安裝 ImageMagick 6.9.7-4 (部份預設模組需要處理圖片，此為相依軟體)
-```sh
-$ sudo apt-get install libjpeg62
-$ wget http://download.sourceforge.net/libpng/libpng-1.5.13.tar.gz
-$ tar xvfz libpng-1.5.13.tar.gz
-$ cd libpng-1.5.13/
-$ ./configure
-$ make
-$ sudo make install
-# 編譯jpeg套件
-$ sudo apt install -y libltdl-dev graphviz libpng-dev libfftw3-dev
-$ sudo apt-get install -y libjpeg-turbo8-dev
-$ sudo apt install -y libgif-dev libjpeg-dev libopenexr-dev libpng-dev libwebp-dev
-$ sudo apt install -y cmake pkg-config libbrotli-dev
-# Build imagemagick
-$ wget http://www.imagemagick.org/download/ImageMagick.tar.gz
-$ tar xvfz ImageMagick.tar.gz
-$ cd ImageMagick-7.1.0-16/ # cd ImageMagick-x.x.x-x(版本號)
-$ ./configure --with-bzlib=yes --with-fontconfig=yes --with-freetype=yes --with-gslib=yes --with-gvc=yes --with-jpeg=yes --with-jp2=yes --with-png=yes --with-tiff=yes --disable-shared --with-modules
-##在configure跑完後，可確認Delegates是否有jpeg png zlib(最後一行)
-$ make
-$ sudo make install
-$ sudo ln -s /usr/local/lib/* /usr/lib/.
-$ sudo ln -s /usr/local/lib/pkgconfig/* /usr/lib/pkgconfig/.
-$ sudo ln -s /usr/local/bin/* /usr/bin/.
-$ convert -list configure #確認為版本7.1.0.0以上
-####以下為舊的imagemagick安裝方式(請不要使用，會有圖片上傳後，解碼失敗問題)
-#$ sudo apt install imagemagick
-#$ convert -version # 檢查是否安裝成功，並確認版本
-#$ identify -version #檢查Delegates是否有jpeg png zlib
-```
-
-## Ubuntu 20.04 才需要的步驟
-
-```sh
-###安裝 libssl1.0-dev
-$ sudo sh -c "echo 'deb http://security.ubuntu.com/ubuntu bionic-security main' >> /etc/apt/sources.list"
-$ sudo apt update && apt-cache policy libssl1.0-dev
-$ sudo apt-get install libssl1.0-dev
-```
-
 ## 設定host IP(避免VM抓不到domain對應的IP)
 ```sh
 # sudo vim /etc/hosts 加入以下內容
@@ -121,35 +64,6 @@ $ sudo apt-get install libssl1.0-dev
 151.101.1.227 index.rubygems.org rubygems.org
 104.192.141.1 bitbucket.org
 ```
-## 安裝 RVM (Ruby 版本和套件的管理程式)
-
-```sh
-$ sudo apt install gnupg2
-$ gpg2 --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
-$ \curl -sSL https://get.rvm.io | bash -s stable
-$ source /home/rulingcom/.rvm/scripts/rvm
-$ sudo vi /etc/apt/sources.list # Ubuntu 20.04LTS add `deb http://security.ubuntu.com/ubuntu bionic-security main`
-$ rvm install 2.1.2
-$ rvm install 2.1.10
-$ rvm --default use 2.1.10
-```
-## 若以上安裝RVM失敗可用另一種方式安裝RVM和ruby
-
-```sh
-$ sudo apt-get install software-properties-common
-$ sudo apt-add-repository -y ppa:rael-gc/rvm
-$ sudo apt-get update
-$ sudo apt-get install rvm
-$ echo 'source "/etc/profile.d/rvm.sh"' >> ~/.bashrc
-$ source "/etc/profile.d/rvm.sh"
-$ rvm install 2.1.2
-$ rvm install 2.1.10
-$ rvm --default use 2.1.10
-```
-## 安裝screen
-```sh
-$ sudo apt-get install screen
-```
 ## 安裝 R4.5
 ### 一、建立 ssh key pair
 ```sh