That’s exactly what is was; as mentioned. it’s a safer alternative to a hard shutdown or reset. It will no doubt be useful for future reference.
The second link Recovering from an interrupted update/upgrade describes the procedure to place you in a position to perform any number of operations.
In a chroot environment you are the super user (root), with unrestricted access to your machine, so every command you use has consequences. In other words, be certain you understand what a command does before using it.
What happens next depends greatly on what the problem is discovered to be. Some of the most common scenarios might include attempting to complete a failed sync/update, repairing or reinstalling the GRUB bootloader and/or kernels, or performing disk operations.
All that and more is possible.
Considering the cause of the problem, attempting to complete the update seems like a good place to start.
If you’re not experienced with the commandline, then you’re at a disadvantage, but as long as you specifically tell others what you’re having trouble with, someone will point you to information needed.
Remember, we can’t see what you see, and we rely on what you tell us. If you’re offered a command to use, and it seems to do nothing, avoid just saying “it didn’t work” (or similar), show the command output; the error messages, etc, that might explain why it didn’t work.
You should at least have a reasonable understanding of pacman if completing the update in chroot. If you don’t then these should be helpful;
- Pacman (Arch Wiki)
- Pacman Overview (Manjaro Wiki)
- Get acquainted with Pacman package manager
Regards.
This is incidental, but I note your BIOS hasn’t been updated in a very long time. It might be beneficial at some point to check the Gigabte site for the latest available.
Aside:- I had a Z68XP-UD4 many years ago, and there was an experimental (at the time) UEFI BIOS available. That might be a consideration.