It’s very easy to change repos in Manjaro. The following are commands that will change your Manjaro system to the repos indicated:
For the stable branch:
sudo pacman-mirrors --api --set-branch stable
For the Testing branch:
sudo pacman-mirrors --api --set-branch testing
And for the unstable branch:
sudo pacman-mirrors --api --set-branch unstable
Finally, for my own sanity in searching and failing to find this one time and time again…..
Use this next command when you are receiving not found errors when fetching packages or package lists.
There is another file called /etc/pacman-mirrors.conf that by default is configured to re-write your mirrorlist in a list with the fastest at the top, descending to the slowest, when the system is given the terminal command:
sudo pacman-mirrors --fasttrack && sudo pacman -Syyu
This is a remarkably streamlined system compared to the ways that it has been in the past for the pacman rolling release system to manage its mirrors, let alone to rank their speed.