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====== Ubuntu distribution upgrade ======

Command Line Way to Upgrade Ubuntu

Before upgrading to Ubuntu 17.04 Zesty Zapus, please make sure to update and upgrade the current Ubuntu release using the following commands:

  sudo apt update
  sudo apt upgrade
  sudo apt dist-upgrade

Now run the following command to install update-manager-core package:

  sudo apt install update-manager-core

Once the update-manager-core package is installed, edit the /etc/update-manager/release-upgrades file and set Prompt value to normal. Prompt=normal

  sudo gedit /etc/update-manager/release-upgrades

Now finally, run do-release-upgrade command to upgrade to Ubuntu 17.04 Zesty Zapus:

  sudo do-release-upgrade -d

Once upgrade process is finished, restart the system and check the Ubuntu version using the following command:

  lsb_release -a

List only installed packages
  apt list --installed

Install specific package
  apt install /tmp/mypackage.deb
  
Remove a package
  apt purge <pkg_name>
  
Remove unneeded packages
  apt autoremove
  
List content of a package
  dpkg -L <pkg_name>
  apt-file list <pkg_name>
  
To find the package correspondant to a file
  dpkg -S /tmp/myfile
  apt-file search /tmp/myfile

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