RoboPhilip

I am having similar problems, but t is launching. My problem is that, while everything else is working fine, when i launch Minecraft through multimc, none of the mods i installed take effect. I have mods like immersive portals, buildcraft, etc, and what i end up playing is vanilla Minecraft. I am not sure if it is because i use linux Ubuntu, but it should be working. I did all the steps correctly, i hope, and none of the mods are working. What should i do?