ISO for Ubuntu 14.04 (and 16.04) for Linux-based Dell laptops

Hi,

I just received my Precision 5510 with Ubuntu 14.04 pre-installed.

I noticed the Ubuntu installed on the laptop is not a vanilla Ubuntu distro. For example, it has a few additional DELL specific apt repos added to it. Or it has the Recovery Disk creator app pre-installed, etc.

I've created a Recovery USB already, but does DELL host this slightly modified OEM ISO for the Ubuntu somewhere on their servers for download -- in case someone loses the recovery media and needs to download it from somewhere?

Also I noticed that DELL specific repos for 16.04 are already on Ubuntu's repos (dell.archive.ubuntu.com/.../xenial). Does it mean that 16.04 is good to go for my laptop now?

And if I want to clean install 16.04, does DELL provide a customised ISO file with their apt repos already pre-configured and extra apps pre-installed?

Two more questions:

• Any extra steps I need to do if I want to install Kubuntu 16.04 on my Precision 5510? (e.g. what apt repos should I add?)
  • Even better, does DELL provide customised Kubuntu ISO files?

• How well does Fedora work on these machines?

Thanks in advance.