Also fixed for me. I had to delete my forge and liteloader installs and re-install them after re-running 1.8.9, now everything is working! Maybe their aws servers were down for a bit or something?
Same issue here on Ubuntu 17.10 and both Oracle & Open JDK 8. Only version that will launch is latest snapshot.
Sorry about that! When I searched Shulker I didn't see it in the list.
Confirmed in 1.12.2
Also fixed for me. I had to delete my forge and liteloader installs and re-install them after re-running 1.8.9, now everything is working! Maybe their aws servers were down for a bit or something?