I boot on Live USB and reinstall the OS. Now it works

. So i think my problem caused by not selecting to install grub

.
the next is on Firefox, my ff didnt have default search engine on search bar (so I've to add manually using "add to search bar" add on)
ah, I edit this post to add this:
can I have icon only task manager on this KDE? its like dockbarx on gnome, or taskmanager on windows 7(dunno its called task bar or taskmanager). I still cant find it on synaptic..
my wireless card detected nicely (bcm 4313) and work great on my home wifi. I think this system is a dang great..
I haven't test 2 thing:
- copy a big files from hdd to USB flash using dolphin (Kubuntu 12.04 often fail to do that task, its just unfinished), and that flash is in good condition
- use the networkmanager to connect to my university hotspot (Kubuntu 12.04 won't connect to that AP but able to connect on other AP)