How to install OpenModelica 1.9.5 on Ubuntu 20.04? - installation

I installed the latest version on OpenModelica (version 1.16.5) on Ubuntu 20.04.
However, this version has problems with the packages (examples).
So, by recommendation, I'm trying to install version 1.9.5 or 1.10.X, without success.
Since I'm a novice Linux user, I don't know how to do this.
On the site,
"https://openmodelica.org/download/download-linux"
for older versions, it is suggested to use the line
"deb https://build.openmodelica.org/omc/builds/linux/releases/1.xx.x/".
I honestly do not know how to do it and that is why I ask for help to be able to carry out this procedure.
Grateful.

If you are on Ubuntu 20.04 (focal), you can only install OpenModelica versions released after April 2020 (because we don't update the old releases for newer OpenModelica versions). The oldest you can install without using docker or compiling your own OpenModelica is the following as /etc/apt/sources.list.d/openmodelica.list:
deb https://build.openmodelica.org/omc/builds/linux/releases/1.16.0/ focal release
Which example does not work in the latest OpenModelica for you? We have done some fairly extensive testing and the change from the old to the new frontend is a net gain in the number of models that simulate.

Now this error occurs after installing Scilab through the terminal.

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