i am facing the exactly same error message.can you please share what was wrong in the /etc/hosts file?
The file in my host is
root@SanjeevUbantu:/opt/sybase/log# cat /etc/hosts
127.0.0.1 localhost
127.0.1.1 SanjeevUbantu
# 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