Comment 16 for bug 1840232

Test Results:

I customized ubuntu-18.04.3-desktop-amd64.iso using Cubic.

I executed the steps in your install.sh file.
However, I did not use `sudo`. (Using `sudo` wouldn't make a difference).

I updated using `sed` as I described above. (This is just a matter of style, and wouldn't make a difference).

Cubic successfully created the customized ISO. Note that Cubic calculated checksums for 331 files on the repackage ISO page.

I installed the customized ISO into a virtual machine in Virtual Box.

I did select English as the language, and I selected New York as the time zone.
This is different then what you did, so I may retest using Switzerland, as in your screenshot ( especially since you got a time zone error).

As a result, I was able to successfully install Cubic in Virtual Box and login.
Packages specified in your install.sh file were installed.

However, PlayOnLinux displayed the error, so you may need additional packages:

    PlayOnLinux is unable to find 32bits OpenGl libraries.
    You might encounter problems with you games

Nevertheless, the installation succeeded without issue.