I saw your message and Wizard's message back to you about this thread in the Status section. So I thought I'd help you get back on track.
In that message, you asked how to you move the entire contents of one drive to another drive. I suggest that you don't do the "entire" contents and pick and choose what you really need and want. Since this is about a "scrambled eggs" Ubuntu, I'm going to guess that we're talking about your hard drive with Ubuntu on it. You don't need everything from that drive on the new one, only what's in /home/yourname. So I'd suggest only copying that. Above you say you have a laptop, so there's 1 of 2 ways your going to get data from one drive to another. If your laptop has 2 bays for hard drives, insert both. If you only have 1 hard drive bay, you're going to have to purchase something that will allow you to plug the other one into a USB port. I bought this for the same purpose
https://www.amazon.com/gp/product/B00BIE996S/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1.
Then you have to boot to an OS that will work, I suggest booting to your new Ubuntu 18.10 installation media. Since you ask how to mount it, I'm assuming you don't know how to boot up to the installation media. Power off your laptop. In the status message you said you can't get it to reboot, so just press and hold the power button till it powers off, then turn it on again. Very shortly after turning it on you should see an HP on the screen and at the bottom some instructions to boot with different options, 1 will be for setup or bios and the other should be for boot options. On my Dell, the boot options are F12, while the HP screen is up, press F12, if that's what HP uses and do it before it goes to the next screen. If you did it correctly you should get a menu. It should have hard drive, maybe CD Rom, USB Device (names may be slightly different). Select the one where your Ubuntu is plugged into and then enter. This will boot up the installation media, a clean version of Ubuntu. Install Ubuntu to your new hard drive by clicking the Install To Harddrive icon.
After you get Ubuntu installed and booted up, you can copy the data from the old hard drive to the new one by plugging in the drive, opening to Gnome File managers and drag and drop from old to new.
Let me know if you have any additional questions. Keep them in this thread