Ubuntu Linux distribution, by default, disables the root account. To run a command with root privileges, sudo has to be used before the command.
When the disk partition is filling up quickly, it’s quite an hassle for the system administrator to find out the location of the files taking up the most space.
On a typical Fedora installation, you are asked for a root password and you will given an option to create accounts for normal users.
On the other hand, Ubuntu only allows account creation for normal users, root logins are disabled by default.