problem with hostname

[pkaplan1 at comcast.net]

When I first set up my box the system prompt read: 

<username>@<hostname>:$ 

Recently it changed to : 

<username>@(none):$ 

When I need to invoke sudo I get: 

<username>@(none):~$ sudo <command> 
sudo: unable to resolve host 
sudo: unable to resolve host 
sudo: unable to resolve host 
sudo: unable to resolve host 
[sudo] password for <username>: 

I can set the hostname with: 

sudo hostname <hostname> 

but the new hostname is not retained after reboot. 

Shouldn't the following define my hostname? 

<username>@(none):~$ cat /etc/hosts 
127.0.0.1 localhost 
127.0.1.1 <hostname> 
# The following lines are desirable for IPv6 capable hosts 
::1 localhost ip6-localhost ip6-loopback 
fe00::0 ip6-localnet 
ff00::0 ip6-mcastprefix 
ff02::1 ip6-allnodes 
ff02::2 ip6-allrouters 
ff02::3 ip6-allhosts 

<username>@(none):~$ cat /etc/hostname 
<hostname> 

How can I restore <hostname> permanently? 
TIA 
Paul 




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