White screen on ubuntu 20.04
Kde plasma
Minecraft 1.12.2 with 95 mods:
[✔️] [1.12.2]+SecurityCraft+v1.8.20.2
[📁] 1.12 (folder)
[✔️] AdFinders-1.12.2-2.3.17.0-build.0559
[✔️] AdLods-1.12.2-1.0.8.0-build.0504
[✔️] Air-Cooled+Pack+[MTS]+1.10.2-14.0.0-1.0.1
[✔️] AppleSkin-mc1.12-1.0.14
[✔️] bettercaves-1.12.2-2.0.4
[✔️] BetterCombat-1.12.2-1.5.6
[✔️] BetterFps-1.4.8
[✔️] BetterPlacement-1.0.0-1
[✔️] Bountiful-2.2.2
[✔️] buildcraft-all-7.99.24.7
[✔️] cc-tweaked-1.12.2-1.89.1
[✔️] CD4017BE_lib-1.12.2-6.5.1
[✔️] cfm-6.3.0-mc1.12.2
[✔️] Chameleon-1.12-4.1.3
[✔️] Charset-Lib-0.5.6.5
[✔️] CodeChickenLib-1.12.2-3.2.3.358-universal
[✔️] collective-1.12.2-2.64
[✔️] coroutil-1.12.1-1.2.37
[✔️] CreativeCore_v1.10.65_mc1.12.2
[✔️] CustomNPCs_1.12.2-(05Jul20)
[✔️] energyconverters_1.12.2-1.3.7.30
[✔️] EnhancedVisuals_v1.4.2_mc1.12.2
[❌] EpicFightMod-1.12.2-2.2.7.jar (disabled)
[✔️] extrautils2-1.12-1.9.9
[✔️] ForgeEndertech-1.12.2-4.5.5.0-build.0561
[✔️] Forgelin-1.8.3
[✔️] ForgeMultipart-1.12.2-2.6.2.83-universal
[✔️] Golden+Airport+Pack+[Immersive+Vehicles]3.2.5
[✔️] Helicopter_Pack-2.7.0
[✔️] Hwyla-1.8.26-B41_1.12.2
[✔️] IAV_Parts_Pack_Beta_3
[✔️] iChunUtil-1.12.2-7.2.1
[✔️] Immersive+Vehicles-1.12.2-20.3.0
[✔️] ironchest-1.12.2-7.0.72.847
[✔️] IV_Trin_Part_Pack_2.12.0
[✔️] jei_1.12.2-4.16.1.301
[✔️] LunatriusCore-1.12.2
[✔️] mcef-1.12.2-1.31
[✔️] MCMultiPart-2.5.3
[✔️] Mekanism-1.12.2-9.8.3.390
[📁] memory_repo (folder)
[✔️] minecolonies-1.12.2-0.11.804-RELEASE-universal
[✔️] MineMenu-1.12.2-1.6.10-universal
[✔️] MoBends_1.12.2-1.0.0-beta-20.06.20
[✔️] MouseTweaks-2.10-mc1.12.2
[✔️] MrTJPCore-1.12.2-2.1.4.43-universal
[✔️] MTS_Official_Pack_V19
[✔️] obfuscate-0.2.6-1.12.2
[✔️] OpenComputers-MC1.12.2-1.7.5.192
[✔️] openscreens-1.12.2-1.0.1
[📁] OpenSecurity (folder)
[✔️] OpenSecurity-1.12.2-1.0-83
[✔️] opensolidstate-1.0
[✔️] OptiFine_1.12.2_HD_U_G5
[✔️] Pam's+BrewCraft+1.12.2-1.0.2
[✔️] plethora-1.12.2-1.2.3
[✔️] PortalGun-1.12.2-7.1.0
[✔️] ProjectRed-1.12.2-4.9.4.120-Base
[✔️] ProjectRed-1.12.2-4.9.4.120-compat
[✔️] ProjectRed-1.12.2-4.9.4.120-fabrication
[✔️] ProjectRed-1.12.2-4.9.4.120-integration
[✔️] ProjectRed-1.12.2-4.9.4.120-lighting
[✔️] ProjectRed-1.12.2-4.9.4.120-world
[📁] railcraft (folder)
[✔️] railcraft-12.0.0
[✔️] Redstone+++ver1.3e
[✔️] RedstoneControl-1.12.2-0.3.1.3
[✔️] Schematica-Mod-1.12.2
[✔️] SereneSeasons-1.12.2-1.2.18-universal
[✔️] StorageDrawers-1.12.2-5.4.0
[✔️] techguns-1.12.2-2.0.2.0_pre3.2
[✔️] UNU+Civilian+Pack+[MTS]+1.12.2-19.15.5-4.2.5
[✔️] UNU+Military+Pack+[MTS]+1.12.2-19.15.5-4.0.2
[✔️] UNU+Parts+Pack+[MTS]+1.12.2-19.15.5-4.3.2
[✔️] villagernames_1.12.2-3.3
[✔️] Waywardcraft_Pack_V02
[✔️] weather2-1.12.1-2.6.12
[✔️] webdisplays-1.12.2-1.1
[✔️] worldedit-forge-mc1.12.2-6.1.10-dist
[✔️] zettaindustries-1.3-1.12.2-161

Try the latest release https://github.com/ds58/mcef/releases/tag/1.12.2-1.32