While apt command helps you to install packages from command line, Synaptic is a GUI interface that allows you to install applications easily. Once all the updates are installed then reboot the system once using following command, $ sudo reboot Open the terminal and run beneath commands, $ sudo apt update I am adding my existing user ‘ pkumar’ to sudo user so that now onwards all the tasks can be performed by local user. Note: You have to run these commands from root user. To install sudo and add your username to the sudo group, use the following command provided below: You also need to add your user to the sudo group. Next important thing you need to do is install the sudo package in the system to get administrative privileges. Once it is disabled, you can go on update repository index without any issues. Open the terminal, switch to root user and then comment out or remove cdrom repo from /etc/apt/sources.list file.
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