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Created attachment 159474 [details] shot 1 When using Ubuntu Gnome 16.04 (xenial), the UI is broken, probably due to GTK and/or font stuff. When using Metal or darcula theme it works ok. I used a dev build of NB 8.2 to verify, Java 8u92 from Oracle.
Created attachment 159475 [details] shot 2
I have also the same problem.
*** Bug 262539 has been marked as a duplicate of this bug. ***
*** Bug 262626 has been marked as a duplicate of this bug. ***
I've got the same issue. I'm on GTK+ 3.20 in combination with Ubuntu 16.04 due to the use of the gnome-staging ppa, in case it's related to a specific version of GTK+. Ubuntu 16.04 ships with GTK+ 3.18 by default .
This seems to be related to the Gnome Font setting. When not using the (default) Ubuntu Fonts or Cantarell Bold/Regular fonts NetBeans looks ok. It is a work around but pretty invasive to have to change the system fonts.
The issue remains in Ubuntu GNOME 16.10. It renders Netbeans completely unusable due to the lack of being able to properly navigate through the project/source trees. Changing to a different interface font like Comic Sans in the GNOME settings does indeed serve as a work-around, but this is of course not a solution. Unfortunately it isn't possible to just change the interface font of Netbeans. Only the fontsize can be provided as a start-up parameter.
Created attachment 165723 [details] Menu NetBeans IDE 8.2 (Build 201609300101) Oracle Linux 7.5 Java version "1.8.0_161" GNOME 3.25.4
Font: Cantarell Regular