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Sep 16 23:03:14 youmu kernel: ptrace of pid 4250 was attempted by: Unity (pid 4303) Sep 16 23:03:15 youmu kwin_x11[579]: QXcbConnection: XCB...
There is a symlink pointing /opt to /media/Makai/opt
ldd /opt/Unity/Editor/Unity linux-vdso.so.1 (0x00007fff371a2000) libgtk-x11-2.0.so.0 => /usr/lib/libgtk-x11-2.0.so.0 (0x00007f6be7643000)...
Rebooting doesn't fix it.
I get the same issue with the newest UnityEditor 5.1.0f3+2015090301-2 . It was working before, I don't think anything has changed.