[SOLVED] Apt-get error

[novish143]

Hi everybody, I've just installed Ubuntu 8 on my PC, and whenever I am trying to install something, it gives an error:

sudo apt-get install samba
sudo: unable to resolve host ravish

, so I am unable to install anything, even through graphical package manager, I can connect to internet, I've also modified my Environment variable for proxy it isn't working.

plz tell me what to do

[kostasan]

type su . Give your password then and you will become root. Apt-get should work this way. To solve the problem, become root using su and then type nano /etc/hosts. Add this line:
127.0.0.1 ravish
Save the file with Ctrl + O and exit with Ctrl + X

[bigtomrodney]

You will need to use sudo su or sudo bash rather than su as the password for root is encrypted in Ubuntu.

[novish143]

You will need to use sudo su or sudo bash rather than su as the password for root is encrypted in Ubuntu.

type su . Give your password then and you will become root. Apt-get should work this way. To solve the problem, become root using su and then type nano /etc/hosts. Add this line:
127.0.0.1 ravish
Save the file with Ctrl + O and exit with Ctrl + X

thank to all you folks, I've solved the problem.
there was some problem in my /etc/hosts file.
every thing is working now.