Today I broke my Manjaro system.
I wanted to update my pacman-mirrors and somehow landed on an unstable branch. Usually, I use the stable branch.
I mistakingly used Arch Linux’s Pacman Mirrorlist Generator instead of Manjaro’s mirrors.
I had upgraded my system with: sudo pacman -Syyu.
After a reboot, I encountered many errors: lightdm didn’t work anymore, pacman-mirrors broke, etc.:
ModuleNotFoundError: No module named 'pacman_mirrors'
That was a catch-22 because I couldn’t update my pacman-mirrors. Accordingly, I couldn’t switch to packages from an up-to-date repository/mirror.
What did work: setting Manjaro’s mirrors, downgrading packages, then refreshing pacman-mirrors, and updating the system afterward.
First, I opened the file /etc/pacman.d/mirrorlist. On the website repo.manjaro.org I chose a server, for example manjaro.melbourneitmirror.net. Now, I added it to the mirrorlist:
Server = manjaro.melbourneitmirror.net/stable/$repo/$arch
Now I could run pacman:
sudo pacman -Syyuu
S: synchronize local packages with the upstream mirroryy: download the packages from the server even if up to dateuu: downgrade the packages
The command reverted all packages to the stable branch.
pacman-mirrors worked again. I made sure to check out the stable branch. Then I updated my mirrorlist with the 5 fastest mirrors and upgraded my system. Now everything is up to date on the stable branch.
sudo pacman-mirrors --api --set-branch stable
sudo pacman-mirrors --fasttrack 5 && sudo pacman -Syyu