“User Not in Sudoers File – Linux Sudo Permission Denied Error”

• 16 Feb, 2026
• 0 Comments
• 59 Secs Read

“User Not in Sudoers File – Linux Sudo Permission Denied Error”

Introduction

While working as an Oracle DBA, especially during Oracle Grid Infrastructure or Database installation, you may encounter this common Linux error:

learnomate is not in the sudoers file.
This incident will be reported.

You need to boot into GRUB → edit mode

1. Restart system
2. Open GRUB menu
3. Select Ubuntu line
4. Press e (edit)

Now find this line:

linux   /boot/vmlinuz....

At the end of that line, replace:

ro quiet splash

with:

rw init=/bin/bash

Then boot using:
✅ Ctrl + X or F10

✅ After boot you will get root shell directly

Now run:

1) Remount properly

mount -o remount,rw /

2) Set root password

passwd root

3) Give sudo access to your user

usermod -aG sudo learnomate

4) Reboot

exec /sbin/reboot -f

Important

After reboot, login and test:

sudo su -

Conclusion

If you want to build a strong career as an Oracle DBA, mastering Linux is not optional — it is essential. Combining Linux expertise with Oracle database administration skills makes you highly valuable in the IT industry.

Start learning Linux today and strengthen your Oracle DBA foundation.