You likely have lines in your /etc/apt/sources.list file mentioning cdrom or Maverick Meerkat in them. Please disable these by adding # in front of the line or deleting the line and then you should be able to upgrade.
You likely have lines in your /etc/apt/ sources. list file mentioning cdrom or Maverick Meerkat in them. Please disable these by adding # in front of the line or deleting the line and then you should be able to upgrade.