The same or a similar problem I see using Lazarus 1.6 under Ubuntu 16.04 LTS, running X11 VNC Server 0.9.13-1.2build1.
I connected from a windows 10 computer with VNCViewer 6.1.0 from RealVNC to the Ubuntu machine, opened Lazarus and tried to insert a '[' char with AltGr+8 in the Lazarus code editor window. Alternately, no char or wrong chars were inserted. The same happened, when I tried to insert other AltGr combinations like { and ]. Country and keyboards settings on both machines: Germany.
Added a note to case 30544 in the Lazarus Bug Tracker. -- Joe
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