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Re: From installation DVD to original ISO file.

On Thu, 11 Apr 2019 at 01:25, Richard Owlett <rowlett@xxxxxxxxxxx> wrote:

> The solutions I was given at the time revolved around using "isoinfo".

> I've gone in circles trying to find a package including it in *current*
> Debian repository.

Go here:

Under the heading "Search the contents of packages", choose
Display = packages that contain files named like this
Distribution = stable
Architecture = any
Type your search Keyword: isoinfo
Click on Search button.

Read this result page:

This answer assumes I've correctly understood the ambiguity in your
question. (ie guessing what "it" actually refers to?)
If not, please improve the question.