Invalid-entry-length-16-Fixed-up-to-11

After Installing Ubuntu 16.04, Terminal shows Invalid-entry-length-16-Fixed-up-to-11

1.Check status

cat /etc/hostname

Rewolf-S-Product-Invalid-entry-length-16-Fixed-up-to-11

cat /etc/hosts

127.0.0.1 localhost
127.0.1.1 Rewolf-S-Product-Invalid-entry-length-16-Fixed-up-to-11

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

2.Run command as following to modify it
Use SUDO SED to change your computer device name in Ubuntu

sudo hostname -b Rewolf
sudo sed -i 's/Rewolf-S-Product-Invalid-entry-length-16-Fixed-up-to-11/Rewolf/' /etc/hosts