Lockup during update, force shut down and try again?

[ryo]

Try this:
sudo pacman-mirrors -c (whatever your country is)

This will check for any available mirrors, I have to do this a lot on my Manjaro laptop, though never on any of my Manjaro desktops.

Also try "-Syyu" rather than "-Syu" for a forced update of the package list.
And for failing apps you can update them individually using "sudo pacman -S (app name)".
This last one is pretty important to remember, sometimes Manjaro puts new versions of packages through after their testing phase, then many users start having problems on their computers, and then Manjaro reverses it, and you need to re-install the specific package (so it downgrades back to the previous version) in order to be able to update all the other packages again.