to solve this problem I think it is simple problem accured after upgrading release.
edit your /etc/hosts
make the following change
127.0.0.1 localhost 127.0.0.1 yourhostname 192.168.1.100(depend what is your ip address) yourhostname localhost
then run the hostname with --boot option
# hostname -b yourhostname
# hostname -v yourhostname
to recheck exit console/terminal and relogin
to solve this problem I think it is simple problem accured after upgrading release.
edit your /etc/hosts
make the following change
127.0.0.1 localhost 1.100(depend what is your ip address) yourhostname localhost
127.0.0.1 yourhostname
192.168.
then run the hostname with --boot option
# hostname -b yourhostname
# hostname -v
yourhostname
to recheck exit console/terminal and relogin