forcegk [1] filed a deletion request for nvidia-390xx-lts [2]: The nvidia-390xx-dkms is the way to go here. I suggest this package to be deleted and all linux-lts users to use the dkms one.
[1] https://aur.archlinux.org/account/forcegk/ [2] https://aur.archlinux.org/pkgbase/nvidia-390xx-lts/
