The guest additions add all sorts of goodies, most importantly, syncing the time with your host computer.
Since I always forget here are the instructions:
- Click on the console (the black screen) of a running VBox.
- In the menu bar, select Menu -> Install Guest Additions
# on the virtual box menubar # select Devices > Install Guest Additions.... # this "inserts a fake CD" # sudo mkdir /mnt/cdrom sudo mount /dev/cdrom /mnt/cdrom/ cd /mnt/cdrom # pick the amd64 for 64bit # pick x86 for 32bit sudo ./VBoxLinuxAdditions-amd64.run date # should be synced with your computer