sudo apt-get update sudo apt-get install build-essential sudo apt-get install libfontconfig1 sudo apt-get install mesa-common-dev sudo apt-get install libglu1-mesa-dev -y sudo apt-get install build-essential libgl1-mesa-dev sudo apt-get install qtcreator sudo apt-get install qtcreator 기타 sudo apt-get install qt5-doc qt5-doc-html qtbase5-doc-html qtbase5-example 플러그인 해제 재부팅