Can I install Cubic over Debian?

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Cubic doesn't officially support non-Ubuntu flavors.
Since Ubuntu is Debian based, this is an interesting question.
I will look into this...

This is what I posted for https://answers.launchpad.net/cubic/+question/393128...

Cubic version 2018.04 actually allows you to customize Debian ISOs (to some extent).
(This is a side-effect of Cubic now supporting support Ubuntu Server.
Remember that Cubic officially only supports official Ubuntu flavors).

As a test, I ran Cubic in Ubuntu, and I customized a Debian ISO (debian-live-9.4.0-amd64-gnome.iso).

Using the customized ISO, I was able to run the graphical installer in Virtual Box.
(But the Live Environment wouldn't launch).

Installing Cubic in Debian is a little more challenging...

# To prevent error "key is not available: NO_PUBKEY 081525E2B4F1283B", execute the following
$ sudo apt-get install dirmngr
$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 081525E2B4F1283B

# Then add the Cubic PPA and install
$ sudo apt-add-repository ppa:cubic-wizard/release
$ sudo apt update
$ sudo apt install cubic

If you can resolve the following dependencies issues in Debian 9.4, you should be able to install Cubic.
    Depends: python-appindicator (>= 12.10.1) but it is not going to be installed
    Recommends: syslinux-common (>= 3:4.05) but it is not going to be installed
    Recommends: isolinux (>= 3:6.03) but it is not going to be installed

Otherwise, you can run Cubic in Ubuntu to customize your Debia ISO.
You will need to manually enter values for Custom ISO Filename and Volume ID. For example...

    Filename: debian-live-9.4.0-amd64-gnome-custom.iso
    Volime ID: Debian 9.4.0 amd64 Gnome Custom

Also, inside the chroot environment DNS lookups do not work.
You can probably solve this by creating an appropriate link to a valid resolv conf.