this post was submitted on 25 Dec 2023
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Ubuntu Linux
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Linux for Human Beings.
Ubuntu is a popular Linux operating system for PC / mobile devices, etc.
Developed by Canonical & based on Debian (another older Linux OS) which is known for it's rock solid stability.
Ubuntu is trusted everywhere computing by professionals and common users alike.
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Are you sure you are inputting the right password? For instance, are you sure your keyboard layout is correct? If the keyboard layout is different, you may think you type one thing but type another.
It is also possible that you have simply misspelled the password during setup. A reinstall is the only way to fix that I think.
A reinstall is only needed if your forgot your disk encryption passphrase. See my other comment in this thread for how to reset forgotten root and/or user passwords.
Unless I'm missing something, the sudo password should be the user's password, so unless they've never logged out as their user, they should've already used the password to login. I wonder if they're trying to use the root/su password instead of their own user's