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Recently installed Debian. After entering the command sudo, terminal display such an error:
radek not in the file sudoers. This incident will be reported.
How to add a user to the sudoers file?

At the beginning of the log to the root account with the command:

its -

and enter the root password.

Next:

sudo gedit /etc/sudoers

or edit the file with other editor such as nano.

nano /etc/sudoers

and the tab:

User privilege specification

Under:

root ALL=(ALL:ALL) ALL

Add the exemplary user named Linux:

linux ALL=(ALL:ALL) ALL

I save.

Username of course, give your.
That's it 😉

Debian after installation (network installation) does not add the first user to sudoers. It remains to proceed as above.