Since about a week, whenever I try to shut down or reboot my computer (in any way — CLI and GUI alike) the screen goes black (as expected) but then this message appear:
… and stays like this forever.
I tried closing as many programs as possible before rebooting, no success.
Sometimes if I shut down very soon after start up it shuts down properly, but that’s the only case…
you can try disabling plymouth, see the links i this topic
https://wiki.archlinux.org/title/keyboard_shortcuts#Kernel_(SysRq)
https://docs.kernel.org/admin-guide/sysrq.html
I would advise you to uninstall plymouth, remove any reference to it in your /etc/mkinitcpio.conf, and then rebuild your initramfs with… 
sudo mkinitcpio.conf -P
Also edit your /etc/default/grub and remove the word “splash” from the line starting with “GRUB_CMDLINE_LINUX_DEFAULT=”, and then run…
sudo update-grub
An alternative that works for me is to perform a two-step shutdown.
Step 1. Log out of the Desktop to the LightDM screen or whatever you use.
Step 2. Execute shutdown or Reboot from the LightDM (or…) screen.
This process seems not to hang and flows promptly without problems for me.
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