- Restart Ubuntu: sudo reboot

- English: sudo apt-get install ibus-unikey

- Install a package .DEB: sudo dpkg -i DEB_PACKAGE

- Install a package .bundle:

sudo chmod a+x BUNDLE_PACKAGE

sudo ./BUNDLE_PACKAGE

- Install GCC compiler: sudo apt-get install build-essential

- Remove a package: sudo dpkg -r PACKAGE_NAME

- Reconfigure an existing  package: sudo dpkg-reconfigure PACKAGE_NAME