I was getting the same installer error every single time:
E: Sub-process /usr/bin/dpkg returned an error code (1) Some packages are in a broken state…
I tried:
Re-downloading the ISO several times (different editions + tools)
Using different USB sticks and mounting methods
Switching between installation types and partitions
Same crash each time.
Eventually I discovered the cause: it only fails when the “Install third-party software for graphics and Wi-Fi hardware and additional media formats” option is checked.
As soon as I unchecked that box, the installation finished normally.
I've moved this over to Feedback as it might be interesting to the developers to take a closer look at it.
If you go into Software & Updates (available in the applications menu) and over to the additional drivers tab, do you have any downloads available?
And could you share the output of running this command in a terminal window (also available in the applications menu)?
sudo lshw
This will list all of the hardware information, which might turn out to be quite lengthy so it's probably best to use something like pastebin.com to upload that, and paste the link here.