I have three files with bashrc in the name, but I can’t save any of them; they are read-only, all with root ownership. I have two files called bash.bashrc, and three called dot.bashrc.

• bash.bashrc in /etc.
• dot.bashrc in /usr/share/base-files.
• bash.bashrc in/media/jamesray/0c86863c-3982–4e93–9250–0b6074f92628/etc
• bash.bashrc in /usr/share/doc/adduser/examples/adduser.local.conf.examples
• dot.bashrc in /usr/share/doc/adduser/examples/adduser.local.conf.examples/skel

I only installed Ubuntu yesterday. How do I change a file with root ownership, and which file should I change?