I got a brand new Lenovo Thinkpad T530 from my work recently, with xubuntu installed on it. It's extremely snappy, apart from booting. The moment it's slow (~2 minutes) is between entering my password in the login screen up until the point where my desktop comes up. I've been able to trace the problem to the existence of a
usb0 network interface, which is trying to come up.
If I run
sudo ifconfig usb0 down before entering my password (through another screen), it shows my desktop almost immediately. Google doesn't make me any wiser as to how I should disable this
usb0 interface, but I'm pretty sure I won't use it and I'd like my laptop boot a bit faster.