Anyone else have the problem where xorg server displays the error: 
error while loading shared libraries: libnettle.so.7: cannot open shared object file: No such file or directory
if one updates from nettle-3.5.1-2 to nettle-3.6-1?.... Are my mirrors not updated? I'm staying with the former nettle package until xorg-server update from extra/obextra repo. spacefm with nettle-3.5.1-2 is broken but I will use different FM until solution comes up.
You must have a quicker mirror, on mine I just checked and nettle 3,6-1 is on testing core has 3.5.1-2
Soon the update xorg-server will be on obartun repositories, to start X right now you should do this:
Hopefully it is still in your cache-repository:
sudo pacman -U  /var/cache/pacman/pkg/nettle-3.5.1-2-x86_64.pkg.tar.xz
If not you must download it from archive 
cd /var/cache/pacman/pkg
sudo wget https://archive.archlinux.org/packages/n/nettle/nettle-3.5.1-2-x86_64.pkg.tar.xz
Then run the pacman command again
Also you may want to install this terminal because the fancier terminals may not work. 
sudo pacman -S rxvt-unicode
Use it to update to nettle 3.6.
Once you are on X you have to upgrade again as some things don't work without it.
Fixed

Just synchronize and update

Powered by Obarun