It’s much better to install ImageJ directly instead of apt install ImageJ. How to install ImageJ in Linux.
Ubuntu 16.04 has a bug in /usr/bin/imagej. While it’s always better to NOT use Ubuntu’s version of ImageJ, instead downloading ImageJ directly, here’s how to...
how to save stack of images into FITS file with ImageJ.
Workaround for non-working Cinepak videos in ImageJ by using FFmpeg to convert to raw AVI, then read with ImageJ.
If ImageJ won’t start on Windows, try the one-time command ImageJ-Win64 –cp jars/javac.jar and thereafter the ImageJ icon should work normally.