Update dependencies.rst (matplotlib#29292)

* Update dependencies.rst

without sudo will result in an error, because apt requires elevated privileges to install packages on our system.

* Update doc/install/dependencies.rst

Co-authored-by: Thomas A Caswell <tcaswell@gmail.com>

---------

Co-authored-by: Thomas A Caswell <tcaswell@gmail.com>

Author: saikarna913

doc/install/dependencies.rst

@@ -256,7 +256,7 @@ source files.
    .. tab-item:: Linux
 
       On some Linux systems, you can install a meta-build package. For example,
-      on  Ubuntu ``apt install build-essential``
+      on  Ubuntu ``apt install build-essential`` with elevated privileges.
 
       Otherwise, use the system distribution's package manager to install
       :ref:`gcc <compiler-table>`.