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How to solve package installation problems and grant permissions to files.

Hello Recently 2 days ago I installed Linux, "Linux mint 21.1" The first day what I did was just update my repositories with the command. sudo apt upgrade

The next day that I wanted to install DNSmasq I find that the password is incorrect. The only password I have is what When trying to modify some rules of

/etc/password

/etc/shadow

sudoers

use commands

sudo

su-

chmod

chown

But I can neither modify rules nor use the commands because everything tells me that the password is incorrect. I'm thinking of modifying this from grub, but I don't know how I could do this. My other question is that if these are due to package updates, the repositories are from ubuntu, I know this through the graphical interface that indicated the repositories, which linux mint used.

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    the password is incorrect. which one? you can clearly log in to your system so that password seems correct, so which password is "incorrect"? Apr 29, 2023 at 5:16
  • 1
    How did you modify /etc/passwd, /etc/shadow, and /etc/sudoers? These are really important system files. Please tell us in your question what commands you used and what exactly you changed Apr 29, 2023 at 6:58
  • When I log in through the graphical interface to the desktop I write my password which is q But in the terminal I can't enter that password using sudo, su- therefore I can't change any rules of a file. Apr 29, 2023 at 17:11
  • I haven't modified anything, I just updated the repositories, but then nothing could be downloaded from the repositories, and in several tutorials it mentions modifying the /etc/passwd, /etc/shadow, and /etc/sudoers files I wanted to edit but it shows me that the operation cannot be performed, I cannot read write or execute Apr 29, 2023 at 17:20

1 Answer 1

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sudo by itself doesn't do anything, you should see a usage message.

su- should give you a command not found error.

Since sudo apt upgrade worked, you must be in a group with sudo-privileges and the password must be correct.

Try sudo apt install dnsmasq ...

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