Root cause : Manjaro-gnome-settings conflict with manjaro-gdm-ttheme
:: Synchronizing package databases…
core is up to date
extra is up to date
community is up to date
multilib is up to date
:: Starting full system upgrade…
:: Replace manjaro-gnome-assets with community/manjaro-gnome-settings? [Y/n]
:: Replace qemu with extra/qemu-desktop? [Y/n]
resolving dependencies…
looking for conflicting packages…
:: manjaro-gnome-settings and manjaro-gdm-theme are in conflict. Remove manjaro-gdm-theme? [y/N]
error: unresolvable package conflicts detected
error: failed to prepare transaction (conflicting dependencies)
:: manjaro-gnome-settings and manjaro-gdm-theme are in conflict