Get root access for copying files to /usr/share/...?

First, however tempted you might ever get, never "log in with root". It's far too easy to break things beyond repair. Anyway, this is disabled by default so you'd have to do a whole lot more to get to that point.

/usr/ is owned by the root account so to write files in there you need to write them as root. Two methods (there are undoubtedly more but here are the two main ways for most users):

1. Press Alt+F2 to get a run dialogue and in that type gksu nautilus. This will open up a file browser window running as root. Copy your files across but be careful, you can nuke the system like this.

2. A much more direct method is just loading up a terminal and writing:

   sudo cp -R /path/to/files/you/want/copied/ /copy/to/this/path/
   

   (the -R is just there to recursively copy directories)

If you ever want to fire off multiple commands as root without prepending them all with sudo you can run sudo -i or sudo su and you'll get a root terminal. But again, be careful what you do.

You need root access. You can launch nautilus with root access with gksu nautilus or can issue commands with sudo before the command to move or copy. I would not play around with user groups if I were you, as this can mess things up and spoil built in security features.

You can also install Ubuntu tweak and then go to manage scripts . There you will find a script called Browse as root . It will ad a new entry to the context menu wich will alow you browse the selected folder as root.

You just right click from nautilus ... browse as root ... enter password and you can do whatever you want.