The default way a VirtualBox machine connects to the network is using NAT. Since it’s connected to a private network, you can connect to the outside world but other machines cannot contact you (this holds true even for the host machine). NAT is the easiest and most lightweight way of connecting your virtual machine to the network. VirtualBox also supports others ways of connecting to the network such as a bridge adaptor.
This should fix issues with making MacOSX talk to Ubuntu (Samba)
To disable the dashboard:
defaults write com.apple.dashboard mcx-disabled -boolean YES
To enable the dashboard
defaults write com.apple.dashboard mcx-disabled -boolean NO
Dont forget to after running the command.
killall Dock
Ever wanted to know how many cycles your Apple Powerbook battery has done?
ioreg -l | grep Capacity
Most Powerbooks should work well upto 300-500 cycles.