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Fixing ‘cp – cannot create regular file : permission denied’ error when copying to /lib/udev as root

Ubuntu 14

When working with Linux, you may occasionally encounter permission errors. One such error is the ‘cp – cannot create regular file : permission denied’ error. This error typically occurs when you try to copy a file to the /lib/udev directory as root. In this article, we will explore the possible reasons for this error and how to resolve it.

Quick Answer

To fix the ‘cp – cannot create regular file : permission denied’ error when copying to /lib/udev as root, you should first check your user privileges and ensure you are logged in as the superuser. If you are not the superuser, use the ‘sudo’ command before your copy command. Additionally, check for the immutable flag on the directory and remove it if necessary using the ‘chattr’ command. Verify the directory permissions and existence, and ensure you have the appropriate file permissions for the file you’re trying to copy.

Understanding the Error

Before we delve into the solutions, let’s first understand the error. The cp command in Linux is used to copy files and directories. The error message ‘cp – cannot create regular file : permission denied’ means that the cp command is unable to create a regular file in the destination directory due to insufficient permissions.

Checking Your User Privileges

The first thing to check when you encounter this error is your user privileges. You need to be a superuser (root) to copy a file to the /lib/udev directory.

You can check your user privileges by running the command whoami. If the output is root, you should have the necessary permissions to copy the file.

If you are not the superuser, you can use sudo before your command to execute it with superuser privileges.

Example: sudo cp -f /tmp/ok_pcscd_hotplug.sh /lib/udev/.

Here, -f is a parameter that forces the copy by removing the existing destination file if necessary.

Checking the Immutable Flag

If you are still unable to copy the file, the directory may have the immutable flag enabled. This flag prevents any changes to the directory.

You can check for the immutable flag by running lsattr /lib/.

If the immutable flag is set, you can remove it using the command chattr -i /lib/udev.

Here, chattr is the command used to change file attributes, and -i is the parameter that removes the immutable flag.

Checking the Directory Permissions

Another possible reason for the error is that the /lib/udev directory is mounted with read-only permissions.

You can check this by running cat /proc/mounts, mount, or cat /etc/mtab.

If the directory is mounted read-only, you will need to edit the /etc/fstab file to change the permissions.

Checking the Directory Existence

Ensure that the /lib/udev directory actually exists. If it doesn’t, create it using the command mkdir -p /lib/udev.

Here, mkdir is the command used to create directories, and -p is the parameter that creates parent directories as needed.

Checking the File Permissions

Lastly, check the permissions of the file you’re trying to copy.

You can do this by running ls -al /tmp/ok_pcscd_hotplug.sh.

Make sure that you have read permissions for the file. If not, you can change the file permissions using the chmod command.

Conclusion

In this article, we have explored the possible reasons for the ‘cp – cannot create regular file : permission denied’ error and how to resolve it. We hope that this information will help you troubleshoot and fix this error when copying files to the /lib/udev directory as root. Remember to always double-check your user privileges, directory permissions, and file permissions when working with Linux.

What should I do if I encounter the ‘cp – cannot create regular file : permission denied’ error?

If you encounter this error, first check your user privileges by running the command whoami. If you are not the superuser, use sudo before your command to execute it with superuser privileges. Example: sudo cp -f /tmp/ok_pcscd_hotplug.sh /lib/udev/.

How can I check if the immutable flag is enabled on the `/lib/udev` directory?

You can check for the immutable flag by running lsattr /lib/. If the immutable flag is set, you can remove it using the command chattr -i /lib/udev.

What should I do if the `/lib/udev` directory is mounted with read-only permissions?

If the directory is mounted read-only, you will need to edit the /etc/fstab file to change the permissions.

What should I do if the `/lib/udev` directory does not exist?

If the directory does not exist, you can create it using the command mkdir -p /lib/udev.

How can I check the permissions of the file I’m trying to copy?

You can check the permissions of the file by running ls -al /tmp/ok_pcscd_hotplug.sh. Make sure that you have read permissions for the file. If not, you can change the file permissions using the chmod command.

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