System froze during kernel update, now not booting

[Aragorn]

[HowTo] Recovering from an interrupted update/upgrade

Difficulty: ★★☆☆☆ So you couldn’t wait until the update process had completed and you went for the reset/power button, didn’t you? And now you’re getting the message that you don’t have a kernel installed. Well, you’re not the only one — we’re seeing it happen all the time. So, here’s how to fix it, you impatient n00b. If you don’t happen to have a recent Manjaro installer USB/DVD/CD handy, direct your browser to this wonderful page, download t…

And for future reference…

[HowTo] Updating Manjaro as safely as possible

The golden rule — which nobody follows, of course — when using a rolling-release distribution…: Always apply the bundled updates by way of the command line in a tty while completely logged out of your graphical environment, so that no shared libraries will be in use that will be overwritten by the update process. The safest way even would be to cleanly reboot your system first before applying any updates, and to then switch to a tty and run the update process from there without logging into…