Hi!
I just purchased Minecraft yesterday and installed Forge with this tutorial: https://minecraft.gamepedia.com/Mods/Installing_Forge_mods#Installation
OS is Arch Linux, Minecraft was installed the recommended way with pacman (package: aur/minecraft-launcher 2.1.5410-1) from AUR
openjdk version "12.0.1"
Started the game, loaded a new world and saved (to get everything downloaded etc.)
Vanilla game is running fine.
(Exited the client)
Installed Forge (https://files.minecraftforge.net/maven/net/minecraftforge/forge/1.14.3-27.0.57/forge-1.14.3-27.0.57-installer.jar) successfully.
Started the game again, selected Forge from the dropdown menu and hit PLAY.
Error is: Game crashed An unexpected issue occured and the game has crashed. We are sorry for the inconvenience.
launcher_log.txt: https://paste.ee/p/yoBJq
(cropped the asset loading)