LG optimus P-500 firmware update: PC suite for Linux?
You may try to run Windows copy in VirtualBox. VB has ability to connect physical USB devices to virtual machine. So Windows will detect your phone. 
BUT BEWARE! Using such way for flash your phone may render it unusable (brick your phone, in another words). It is good to make sync between phone and PC.

Also I'd like to see native Linux version of PC Suite too.