Kubuntu 18.4
Open JDK 8
Radeon driver 19.50
Minecraft 1.7.10 with optifine_HD_U_E7 - stable 60fps
With Gregtech 6.11.26 - from 9 up to 56fps (and freeze about every 5 sec.)
P.S. this result is better than on windows 10 (with it’s stable 2 fps) 
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