Grub booting problem partition and dual os

GRUB Loading Stage1.5
Grub Loading Please wait
ERROR 17

During Live CD Terminal Shown this partition.

Device Boot Start End System
/dev/sda1 1 2582 HPFS/NTFS
/dev/sda2 6854 7296 Hidden W95 FAT32(LBA)
/dev/sda3 2853 6853 W95 Ext'd(LBA)
/dev/sda5 5518 5779 Linux Swap
/dev/sda6 2853 5517 W95 FAT32
/dev/sda7 5780 6853 Linux
try it with but error is coming
apt-get install grub
bash: grub: command not found
root@ubuntu:/# apt-get install grub
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  grub-common
Suggested packages:
  grub-doc mdadm multiboot-doc
The following NEW packages will be installed:
  grub grub-common
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 498kB of archives.
After this operation, 1171kB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
  grub-common grub
Install these packages without verification [y/N]? y
Err http://ftp.iitm.ac.in jaunty/main grub-common 1.96+20080724-12ubuntu2
  Could not resolve 'bsnlproxy.iitk.ac.in'
Err http://ftp.iitm.ac.in jaunty/main grub 0.97-29ubuntu53
  Could not resolve 'bsnlproxy.iitk.ac.in'
Failed to fetch http://ftp.iitm.ac.in/ubuntu/pool/main/g/grub2/grub-common_1.96+20080724-12ubuntu2_i386.deb Could not resolve 'bsnlproxy.iitk.ac.in'
Failed to fetch http://ftp.iitm.ac.in/ubuntu/pool/main/g/grub/grub_0.97-29ubuntu53_i386.deb Could not resolve 'bsnlproxy.iitk.ac.in'
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
root@ubuntu:/# apt -get update
The program 'apt' can be found in the following packages:
 * openjdk-6-jdk
 * sun-java5-jdk
 * sun-java6-jdk
Try: apt-get install <selected package>
bash: apt: command not found
root@ubuntu:/# --fix-missing
bash: --fix-missing: command not found
root@ubuntu:/# --fix-missing?
bash: --fix-missing?: command not found
root@ubuntu:/#
but lan is showing
ubuntu@ubuntu:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:15:b7:58:06:5c
          inet addr:172.24.80.12 Bcast:172.24.87.255 Mask:255.255.248.0
          inet6 addr: 2001:4490:0:10:215:b7ff:fe58:65c/64 Scope:Global
          inet6 addr: fe80::215:b7ff:fe58:65c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:4623 errors:0 dropped:0 overruns:0 frame:0
          TX packets:98 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:376261 (376.2 KB) TX bytes:11860 (11.8 KB)
          Memory:ffce0000-ffd00000

lo Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:16 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1392 (1.3 KB) TX bytes:1392 (1.3 KB)
I am using UBUNTU 9.04. Please help to to solve it..