How to Update Packages in Ubuntu

The apt-get is an important command which works with Advavced Packaging Tool(APT) for updating package list,upgrading package list,installing new software etc.

The packaging system maintains one database which contains information of which packages are installed,which are not installed and which are available to install.The apt-get uses this database to install the various packages.

Update the list of available packages       :  sudo apt-get update

Install any particular package                  :  sudo apt-get install packagename

Reinstall any particular package              :  sudo apt-get --reinstall install packagename

Remove any particular package              :  sudo apt-get remove packagename

Upgrade the packages                              :  sudo apt-get -u upgrade

Upgrade any particular package              :  sudo apt-get -u install packagename

Search any particular package                 :  sudo apt-cache search packagename

SU Authentication Failure

The fresh installation does not assign root/super user password, so when you run su command first time it will show the message authentication failure. so you need to set super user password by running the following command.

$ sudo passwd

then it will ask for new password and then confirm password.

after this u can run su command.