ubuntu 环境下qt的安装

１．进入下载网址https://www.qt.io/download-open-source/#section-2　下载对应自己系统版本的安装包

２．我是ubuntu16.04　32位只找到在线安装包，qt-unified-linux-x86-2.0.3-1-online.run　

直接运行时显示权限不够：　./qt-unified-linux-x86-2.0.3-1-online.run: 权限不够

执行 $ ls -l　，命令得到权限为：　-rw-rw-r，执行chmod u+x qt-unified-linux-x86-2.0.3-1-online.run 　修改权限然后再运行就成功了，跳出界面安装

３．编译其他人的文件时发现提示，By not providing "FindQt5.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Qt5", but
  CMake did not find one.

执行：aptitude search qt4 | grep dev,发现库都没安装，

p   libavahi-qt4-dev                - Development headers for the Avahi Qt 4 int
p   libdee-qt4-dev                  - Qt binding for Dee - development files    
p   libntrack-qt4-dev               - Development package for libntrack-qt4     
p   libpoppler-qt4-dev              - PDF rendering library -- development files
p   libqglviewer-dev-qt4            - OpenGL 3D viewer library based on Qt4 - de
p   libqjdns-qt4-dev                - Simple DNS queries library QT4 wrapper - d
p   libqt4-dev                      - Qt 4 development files                    
p   libqt4-dev-bin                  - Qt 4 development programs                 
p   libqt4-opengl-dev               - Qt 4 OpenGL library development files     
p   libqt4pas-dev                   - Development files for Qt4Pas              
p   libqwt5-qt4-dev                 - Qt4 widgets library for technical applicat
p   libqwtplot3d-qt4-dev            - 3D plotting library based on Qt4/OpenGL (d
p   libsmokeqt4-dev                 - Development files for Qt SMOKE libraries  
p   libsoqt4-dev                    - Qt4 GUI component toolkit for Inventor - d
p   libsource-highlight-qt4-dev     - Syntax highlighting library for Qt (develo
p   libtelepathy-qt4-dev            - Qt 4 Telepathy library (headers and static
p   libvtk5-qt4-dev                 - Visualization Toolkit - A high level 3D vi
p   pyqt4-dev-tools                 - Development tools for PyQt4               
p   pyqt4.qsci-dev                  - Development files for Python Qscintilla2 (
p   python-qt4-dev                  - Development files for PyQt4               
p   qt4-default                     - Qt 4 development defaults package         
p   qt4-dev-tools                   - Qt 4 development tools

然后执行，apt-get install libqt4-dev，安装了最基础的库，编译通过。