Linux has a tough permission rule. Being a root user you are permitted to do anything however the normal user has only some allowed permissions. To run many other commands, they required to ask permissions from the superuser, using keyword sudo after which they need to enter the password.
This requirement of the password after sudo command can be removed using the following steps:
Step 1: Edit sudoers file using the following command
sudo gedit /etc/sudoers
Enter the password, it will open text-editor with sudoers file as follows:
Step 2: Find a line which contains includedir /etc/sudoers.d, press Ctrl + F and paste includedir /etc/sudoers.d
Step 3: Below the line includedir /etc/sudoers.d add the following
username ALL=(ALL) NOPASSWD:ALL
where username is your username.
Save your changes Ctrl + S and exit. From now, you will be able to execute sudo any_command without providing a sudo password.