Modify user name and computer name in ubuntu

Ubuntu: Modify user name and computer name 1. modify the User name: Switch to root and open the following two configuration files: vi/etc/passwd. Change the user name "xxx" to "cyrec, save and exit vi/etc/shadow and change "xxx" to "cyrec". After saving and restarting, the name becomes cyrec @ xxx-dest-top: 2. modify computer name xxx-dest-top to YYY-ZZZ: two steps: [1] Modify/etc/hosts: sudo vi/etc/hosts 127.0.0.1 localhost192.168.76.21 YYY-ZZZ # The following lines are desirable for IPv6 capable hosts: 1 localhost ip6-localhost: 0 ip6-loopbackfe00: 0 Ip6-mcastprefixff02: 1 ip6-allnodesff02: 2 ip6-allroutersff02: 3 ip6-allhosts ~ ~ ~ [2] modify the/etc/hostname content to save the YYY-ZZZ, exit, restart, you can.