If - like me - you get stuck on boot after Manjaro updates to Linux Kernel 5.10, the solution is pretty simple:

1. Boot into 5.9 (you can choose the option in the grub boot menu
2. Reinstall the 5.10 kernel with:

   sudo pacman -S linux510

3. For good measure,...

If you ever get this error:

can't link outside actor context

Followed by something like:

 /Library/Ruby/Gems/2.0.0/gems/celluloid-0.16.0/lib/celluloid.rb:176:in `new_link' /Library/Ruby/Gems/2.0.0/gems/sidekiq-3.3.4/lib/sidekiq/launcher.rb:21:in...