If you don’t have a backup, Clonezilla, timeshift or something similar:
chroot will get you out of this mess:
From my notes:
Boot Manjaro Live Disk
lsblk to determine partition the OS is installed on
(On my systems it is sda1)
In terminal
manjaro-chroot -a
su
mkdir /mnt/manjaro
mount /dev/sda1 /mnt/manjaro (note your OS partition might not be sda1)
cd /mnt/manjaro
Now we can run commands e.g
sudo downgrade package name
pamac list
pamac remove name of package
rar -version
Fix an interrupted update:
pacman-mirrors -f 5 && pacman -Syyu
To exit chroot:
#exit
then
pacman -S dbus