How can I change the Ubuntu file to read-only mode?

To set a Ubuntu file as read-only, you can follow these steps:

1. Use the “chmod” command: Input the following command in the terminal to set the permissions of the file to read-only.

sudo chmod 444 文件名

1. Use the chattr command: type the following command in the terminal to set the file’s properties to read-only.

sudo chattr +i 文件名

This command will make the file unchangeable. To remove the read-only property, you can use the following command:

sudo chattr -i 文件名

1. Use the graphical interface: In the file manager, locate the file you want to set as read-only, right-click on the file, choose the “Properties” or “Permissions” option, in the permissions option, set the read permission for “Owner”, “Group”, and “Others” to read-only.

Please note that the above methods may require administrator privileges (sudo) to execute. Make sure to only set files to read-only that need to be read-only, to avoid accidentally causing other issues.