ubuntu apt-get install and uninstall

Order

• The best uninstall command
  
  apt-get remove packagename --purge && apt-get autoremove --purge && apt-get clean 
  uninstall program (including configuration files), uninstall dependencies, delete all installation packages under /var/cache/apt/archives

• Best Upgrade Software Commands
  
  apt-get update && apt-get upgrade
  
  

apt-cache show packagename Get the relevant information of the package, such as description, size, version, etc. To understand the use dependency is to check which packages the package depends on . Install the package to specify the installation version Reinstall the package uninstaller, including deleting the configuration file and other update sources, and the link address in the update to upgrade the program (excluding dependencies changed) -u full display list upgrade program (including dependencies changed and reorganized dependencies) delete the installation package (saving hard disk space, the next installation needs to re-download the package, the package location: /var/ cache/apt/archives/) delete the uninstalled installation package (Ubuntu14.04 test found that it did not work) uninstall dependent programs
apt-cache depends packagename 
apt-cache rdepends packagename 
apt-get install packagename 
apt-get install package=version 
apt-get install packagename --reinstall 
apt-get remove packagename --purge 
apt-get update  /etc/apt/sources.list
apt-get upgrade -u 
apt-get dist-upgrade 
apt-get clean 
apt-get autoclean 
apt-get autoremove 

apt-get installation location

 

Downloaded software storage location Default location of software after installation Executable file location lib file location /var/cache/apt/archives
 /usr/share
 /usr/bin
 /usr/lib