how to enable bluetooth

Can you give the make and model of the system?

Can you also run:

lsb_release -a; uname -a; dmesg | grep -i blue

Thanks

Make - Dell vostro 1015 laptop

samyogesh@samyogesh-Vostro-1015:~$ lsb_release -a; uname -a; dmesg | grep -i blue
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 11.10
Release: 11.10
Codename: oneiric
Linux samyogesh-Vostro-1015 3.0.0-17-generic #30-Ubuntu SMP Thu Mar 8 17:34:21 UTC 2012 i686 i686 i386 GNU/Linux
[ 18.026281] Bluetooth: Core ver 2.16
[ 18.026879] Bluetooth: HCI device and connection manager initialized
[ 18.026882] Bluetooth: HCI socket layer initialized
[ 18.026884] Bluetooth: L2CAP socket layer initialized
[ 18.031904] Bluetooth: SCO socket layer initialized
[ 18.032630] Bluetooth: Generic Bluetooth USB driver ver 0.6
[ 19.208863] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 19.208867] Bluetooth: BNEP filters: protocol multicast
[ 19.209985] Bluetooth: RFCOMM TTY layer initialized
[ 19.209994] Bluetooth: RFCOMM socket layer initialized
[ 19.209996] Bluetooth: RFCOMM ver 1.11
samyogesh@samyogesh-Vostro-1015:~$

Do you dual boot the system?
Is there a switch to enable/disable bluetooth?

http://www.linlap.com/wiki/dell+vostro+1015

Seems common

Yes It is dualboot

Thought so, in Windows device manager, disable power management on the bluetooth as well it's ability to wake up the OS then boot to Ubuntu.