How do I ensure that a JVM is installed?

[Clifford_Esler]

In terminal on Zorin Core 15.3 [ubuntu-based distro], I’m trying to open LibreOffice Writer using command:

$ lowriter --safe-mode

response is:

javaldx: Could not find a Java Runtime Environment!
Please ensure that a JVM and the package libreoffice-java-common
is installed.
If it is already installed then try removing ~/.config/libreoffice/4/user/config/javasettings_Linux_*.xml
Warning: failed to read path from javaldx
ERROR 4 forking process

Next step:
$ sudo apt install libreoffice-java-common
[successfully installed] but lowriter still does not open
Next step:
removed javasettings xml file to trash
same result, same error msg

So how do I address the remaining error, i.e. “Please ensure that a JVM… is installed”??

[mikekaganski]

Google search suggests something like

apt install default-jre

… which will likely not help you, since JVM is not required for the start, and the warning is red herring, the real problem being something different.