Late 2011 MacBook Pro (macOS 10.13.1) won't boot after update My MacBook Pro won't boot after updating the OS - it's just been saying that it's calculating the time remaining. Then, it shut down unexpectedly and when I try to boot it, it just shows the loading bar stuck at about a twentieth of the way with the Apple logo above it.

Is there anything I can do to continue using my MacBook normally without having to reinstall the OS losing all my data?
Waiting overnight did the trick - just let it finish the update.