uBuntu install NFS from command line

I am try to install with this command:

aptitude install nfs-kernel-server nfs-common portmap
( and also tried sudo apt-get install nfs-kernal-server , with no luck)
It failed,  it seems can't find the right file to download. Here is my screen shot.


ze@ze-HP-Compaq-nc6120-PR125UA-ABA:~$ sudo apt-get install nfs-kernel-server
[sudo] password for ze:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  nfs-common portmap
The following NEW packages will be installed:
  nfs-common nfs-kernel-server portmap
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 429kB of archives.
After this operation, 1,241kB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
  portmap nfs-common nfs-kernel-server
Install these packages without verification [y/N]? y
Err http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main portmap i386 6.0.0-2ubuntu
1.1
  404  Not Found [IP: 91.189.91.13 80]
Err http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main nfs-common i386 1:1.2.2-1u
buntu1.2
  404  Not Found [IP: 91.189.91.13 80]
Err http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main nfs-kernel-server i386 1:1
.2.2-1ubuntu1.2
  404  Not Found [IP: 91.189.91.13 80]
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/p/portmap/portmap_6.0.0-2ub
untu1.1_i386.deb  404  Not Found [IP: 91.189.91.13 80]
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/n/nfs-utils/nfs-common_1.2.
2-1ubuntu1.2_i386.deb  404  Not Found [IP: 91.189.91.13 80]
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/n/nfs-utils/nfs-kernel-serv
er_1.2.2-1ubuntu1.2_i386.deb  404  Not Found [IP: 91.189.91.13 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
ze@ze-HP-Compaq-nc6120-PR125UA-ABA:~$

..
Anyone can point to a correct location for a quick install from command like? Gui interface for me is not availabel because I am login from remote.
Thanks