Instal Linux gak mau booting Harddisk

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pernah saya menginstal Ubuntu di komputer Ersys. E...setelah sukses ternyata gak mau booting lewat hardisk.Sempat bingung apa instalasi nya tidak berhasil alias bermasalah.. :D..? selidik bin selidik eee..ternya ta perlu
ada set2 tannya...
gini ni...masukkan Cd Ubuntunya, kemudian pilih booting harddisk. masuk terminal.....

permata@permata:~$ sudo bash
root@permata:~# fdisk -l
Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 1 608 4883728+ 82 Linux swap / Solaris
/dev/sda2 609 3040 19535040 83 Linux
/dev/sda3 3041 9729 53729392+ 83 Linux
root@permata:~# fdisk /dev/sda

The number of cylinders for this disk is set to 9729.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)

Command (m for help): a /dev/sda2
Partition number (1-4): 2

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
root@permata:~#
root@permata:~#
root@permata:~#