Questions[unetbootin](ubuntu)

I booted my laptop with Ubuntu 18.04 (Try Ubuntu without installing method). Then, I ran the following command:

sudo add-apt-repository universe
sudo add-apt-repository multiverse
sudo add-apt-repository ppa:gezakovacs
sudo apt install unetbootin

I am getting the following message:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 unetbootin : Depends: gksu but it is not installable or
                       kdesudo but it is not installable
              Recommends: extlinux but it is not going to be installed
              Recommends: unetbootin-translations but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

I googled a bit and found that in cases like this, we should search the package name in https://packages.ubuntu.com and I did, the results are here but I don't see a Bionic name there. Does this mean I can't install Unetbootin in Ubuntu 18.04? If I can, please tell me how to do it?

Strangely, but true, you cannot install from the the original site, or run it. So how to install and run UNetBootin?

I'm using Ubuntu 12.04, and every time I try to write an Ubuntu ISO image to a disk so I can install it, Unetbootin says /dev/sdb1 isn't mounted. But Ubuntu mounts the drive automatically when it's inserted, right? What can I do to make Unetbootin recognize the drive is mounted?

I've been using Unetbootin but it occasionally fails to create a bootable usb the way I need it to, especially with the newer versions.

Is there a way I could extract the iso myself?

I need to create a Windows installation USB drive from an ISO file. I used UNetbootin which seems to be the only tool that can write non-Linux images.

The USB disk boots (sort of), but it gets stuck at the very first stage. A UNetbootin splash screen appears that keeps counting down from 10 to 0, and then restarts.

The screen looks like this:

Is there a way to make Windows boot from a USB image created on Linux?