eclipse-nios2 does not open on Ubuntu 20.04. Seems like eclipse requires jdk-7 according to the other post eclipse issue. This is an obsolete java version that has security issues. openjdk7 is not readily available nor easily installed.
Win-7 does not support eclipse-nios because WSL is not supported on Win-7.
Ubuntu * does support quartus but does not support eclipse-nios2 according to
Win-10 : eclipse-nios2 has a Makefile bug - so not patches are required and new warning issues with build
Red Hat is the only linux OS that supports quartus and eclipse. RedHat Linux Enterprise 6 is pay for license.
Is there any open source OS that support both Quartus Prime Pro and eclipse-nios2 ?