Phew I had a little adventure after upgrading: I started the upgrade (on Manjaro Gnome) and went to have breakfast. When I came back, my computer had gone into auto-suspend due to inactivity. I woke it, but the lock screen did not work properly: I could not type anything into the password field. Whenever I typed anything, it immediately disappeared and greyed out the input field. So I went to another TTY and checked the pacman-log. It said “transaction failed” in the end. So I decided to do a reboot. That was a bad Idea 
I ended up in partial upgraded state without any working kernel and without working pacman and pamac. My Manjaro boot stick came to the rescue and with pacstrap I managed to reinstall pacman. Then I chrooted into the system and did the full upgrade again, this time without errors. I rebooted and tadaaa the kernel worked again, but only brought me to the text input prompt. Somehow gdm got uninstalled in the process. Reinstalled GDM, rebooted and here I am typing this report. I definitely learned a few new Linux-rescue-skills today 
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