I'm also unable to install because of the missing lsb_release (I'm using Chromebook-Debian-Buster). I tried to install it, but got the following error:

=======================
...@penguin:~$ sudo apt-get update && sudo apt-get install lsb-core
Hit:1 https://deb.debian.org/debian buster InRelease
Ign:2 https://storage.googleapis.com/cros-packages/80 buster InRelease
Hit:3 https://storage.googleapis.com/cros-packages/80 buster Release
Hit:4 https://deb.debian.org/debian-security buster/updates InRelease
Reading package lists... Done
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package lsb-core is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'lsb-core' has no installation candidate
===============================

Is there another way to get lsb_release installed, or is there some workaround to install OpenModelica without it?

Many thanks
Dave

PS -- I should note that lsb has been discontinued in Debian:
"Debian discontinued LSB support in 2015"