This message indicates that the java program is not in your search path. In that case, the solution is either to install java from the packages available for your choice of linux, or modify your search path if java was installed in some other way.
A first check is to look at your PATH, so open a terminal window and type
echo $PATH
It should return a list including /usr/local/bin and /usr/bin . I would expect java will be in /usr/bin. You can see this with
ls /usr/bin/java
which should show a listing for it.
A confirmation that java is installed would be to run the command the terminal
java -version
which should return something like this that we get on a recent OpenSuse system:
openjdk version "16-internal" 2021-03-16
OpenJDK Runtime Environment (build 16-internal+35-suse-1.3-x8664)
OpenJDK 64-Bit Server VM (build 16-internal+35-suse-1.3-x8664, mixed mode)
Just based on the message you have when you tried AIJ, it is likely that java is not fully installed. In that case when you try "java -version" on the command line it will say something about "not found" too. Here is a link to installing java using the Ubuntu packages that would work if that is your OS:
https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-on-ubuntu-18-04#:~:text=The%20easiest%20option%20for%20installing,sudo%20apt%20update
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