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Where did I go wrong? Kindly advise.Thanks for helping.
Where you went wrong is that you are not reading the replies to your post. As others have told you (See post #12) Debian doesn't include /user/sbin in a regular user's path when running su. You need to run 'su - ' (without the quotes), so that root's env paths are enforced.
Switch to root using su - and then run the commands.
Unless something has changed recently, Debian does not come with sudo configured for use.
When you install debian, if you assign a password for root, then it won't configure sudo. If you don't create password for root, then it will configure sudo for you.
When you install debian, if you assign a password for root, then it won't configure sudo. If you don't create password for root, then it will configure sudo for you.
Yup, it was very annoying till I got used to always running su - instead of plain su.
Try adding the user to the sudoers file:
Switch to root user and then:
Run 'visudo' (without the quotes)
Scroll down to the User Privilege section and add the following line:
Code:
handshake92 ALL=(ALL:ALL) ALL
Save and exit. You should now be able to sudo
>>>>>>>> Thanks to everyone who is kind to help out, the recent tip from "suramya" may have help me to correct the problem.
Now I am able to root it. No more "authentication failure" or "not in the sudoer list".
Another pleasant surprise is now my Debian desktop -Grub boot loader is able to detect my Window 10 partition and able to boot to windows.
Thanks to everyone and kindly treat this topic as settled
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