If an update fails due to lack of space do not reboot. The final stage of update process must complete successfully to update mkinitcpio
and GRUB boot options
I would usually use pamac clean
to free up some more space. But for a 9GiB update probably better to use maclean - a small script to automate safe cleaning functions to free up maximum possible space for update
This is simpler than using sudo manjaro-chroot -a
and cleaning/updating via CLI