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The fonts for the menu, et. al. in the Arduino IDE are difficult to see. So after some googling and looking at /usr/share/arduino/arduino, I used this solution:
edit /usr/share/arduino/arduino
comment out
#JAVA_OPTIONS=("-DAPP_DIR=$APPDIR" "-Dswing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel")
and add
JAVA_OPTIONS=("-DAPP_DIR=$APPDIR")
This replaced the current look with the system appearance.
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