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The root account in Ubuntu is disabled by default. This is to say that it has no password (which is different from it having a blank password) and no attempt to authenticate with root's password will succeed. Therefore, su or su - will not work. Instead, use sudo to run a command as root: sudo command...
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I know root password and login before (my friend can use su...
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it needs to have the set-uid bit turned on, so that it always runs with root permissions, otherwise when an ordinary (non-root) user runs it, it will not have access to the password info in /etc/shadow nor the ability to set the userid to the desired new user.
I can't open a directory with username even after taking ownership & giving it all permissions: sudo mkdir /path/to/the/directory/ sudo chown -R username:username /path/to/the/directory/ sudo ...
20 kwi 2018 · This is basically caused when the current user doesn't have enough permission to read/write/execute the contents of that directory. Here's how you can fix it: To grant the user permission to just the current directory, you could do this: sudo chmod 775 directory_name OR. sudo chmod a+rwx,o-w directory_name
28 mar 2014 · The problem happens when the user doing su - has an ID over 1000, which in your case is true; then pam.d will reject your su - attempt. Look at the mentioned directory and find a file containing something like this: auth requisite pam_succeed_if.so uid >= 1000 quiet_success (Might vary, the important part is uid >= 1000).
7 gru 2023 · If you receive the Permission Denied error on your Linux system, it usually means that your user account does not have the proper permissions on the file or directory you are trying to interact with.
20 sty 2013 · In my new Gentoo installation, su doesn't work as my non-root user: After entering the correct password I get the message "su: Permission denied". What could be causing this? I have already tried reinstalling the package containng /bin/su. EDIT: sudo works.
