Even if Cubic were to read the data "as root", normal users of your final generated ISO would not be able to use apt. So making Cubic read the app data as "root" would not address the underlying problem, and would only push the issue further "down stream."
I am going to close this bug.
Even if Cubic were to read the data "as root", normal users of your final generated ISO would not be able to use apt. So making Cubic read the app data as "root" would not address the underlying problem, and would only push the issue further "down stream."