I have encountered the exact same problem and it apparently has something to do with the video card. I have had success installing the exact same Ubuntu 18 version on two other PC’s but the one pc will only run Ubuntu 16. In my case it is an older PC going back to 2008. That PC will run the latest versions of CentOS and Red Hat linux but it just will not run Ubuntu 18.
Bob
Upgrade to Ubuntu 18 will not boot
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Thanks drummonr. Helps me to know that. I probably wont spent more time trying to install Ubuntu 18 again. Unless I get a different computer. But this one still does what I need it too so no big hurry I guess.
Ubuntu 16 works fine for me. I just get concerned that the security updates might end for Ubuntu 16 eventually. Other than that, don’t know that Ubuntu 18 is any better than 16 for what I use it for.
Where could I find the “pros and cons” of Ubuntu vs Red Hat?
there is a chart just a little ways down this page that shows the hardware updates for 16.04 ended last year and the maintenance updates will last until 2021.
Thank cordx. Ubuntu 16 will be okay for while then.
Am curious. Have you any thoughts or criticisms of the “Tails OS” ?
I was just reading about it online.
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like you, i have only done some online reading about tails. i like what i have read so far. it is purported to be very security- and privacy-focused. from what i understood in my limited reading, it is designed to be run in a live environment from a usb. i just went to their page to check and that is their stated intention (in the quote and link below). i don’t think that means it can’t be installed to a laptop or desktop. just last week or so someone posted a link to a computer store in a different country that pre-loads laptops with all manner of different linux distros and tails was on that list.
Tails is a live operating system that you can start on almost any computer from a USB stick or a DVD.
i had never really noticed before, but live is even in their name acronym. tails = the amnesiac incognito live system 
I think I might try installing “Tails” tomorrow. Am thinking I can install it right over Ubuntu.
are you thinking about using tails because of the privacy and security aspect (if you don’t mind my asking), or are you just wanting to replace ubuntu?
It is assumingly the best known Privacy OS, but I don’t think it is the best. It always depends on the use case, too, though.
Should be clear before further advice.
The privacy and security seems like a good idea. Replacing Ubuntu isn’t really necessary I guess, at least until 2021. I mainly use Ubuntu now just to pay bills online or online orders. I’m only doing that because somehow I got the idea that Windows was always being hacked and Ubuntu was safer in that regard. But I really do not know if that’s true or where I got that idea from. So yes I like the idea of added security if it’s actually true.
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i like the idea of added privacy and security as well. i have tried the tor browser and some android apps to use the tor network (as tails does) in the past for that very reason. i feel fairly safe and secure with the version of ubuntu i use as well. recently @Akito introduced me to a password manager called keepass2 which helps me feel like i am doing better with password management than i was in the past. i think there are different steps we all can take to help ourselves be more secure. one of these days i will probably put tails on a usb to try it out and see what it looks like as well as how well it does on my computer
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@Jimany @cordx A couple of years ago I tried out Subgraph OS which was theoretically much superior to Tails, but the homepage currently says it is still in Alpha and I don’t see much changes there since then, unfortunately. Would like to see it developed further to at least get it out of Alpha. If Subgraph OS would have a stable build, then I think it would be one of the best privacy operating systems out there.
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subgraph certainly looks interesting, but i’m not sure that it bodes well that they haven’t put out any more releases since late in '17. they did send out a few tweets late last year so maybe there is still reason to hold out hope.
i was going to counter with tinfoil hat (mostly just because i like the name), but it looks like they have been in hibernation even longer.
A new suggestion: Try switch to the HDMI port your monitor
( Hdmi handles only 30 hz refresh rate ). Ubuntu have some
problems with high resolutions.
Thanks for reply. That may have been the problem all along.
But since posting this thread, I have installed Linux Mint which has performed much better than Ubuntu ever did on this machine.
Also did some upgrades suggested by Mack. Couldn’t be more satisfied with this forum. Has been much help. Thanks
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@Jimany Glad that our community has helped you with getting the answer . If this is now solved can you mark it solved now and with the answer which solved it for you please? It makes it easier for others to see that it has been and what the answer was. It also helps we Moderators when we are keeping an eye on things to see what has been solved and what hasn’t - Thanks.
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Tried to mark solved. Hope that is how you wanted it done.
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Thanks @Jimany 
I have edited it so it shows it has been solved in the the thread headline, by removing the not solved part. You did the correct thing by ticking the answer that helped to solve it for you.
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Although I had problems directly installing Ubuntu 19 on one PC I inadvertently found a way to install it on the PC that froze everytime I did the install on that PC. I took the hard drive from the problem PC and connected it to one of my PC’s that did have 18 running on it. Then disconnected that PC’s hard drive and installed Ubuntu 18 on the hard drive from the problem PC. Then took that hard drive and placed it into the PC that froze each time I installed Ubuntu 18 on it. It runs fine now with Ubuntu 18 on it. Do not know why this method works but you might want to try it
I am posting this reply from my old HP G60 laptop with Trisquel installed but booting from Linux Format Tails 3.5 distro 64-bit .
So guess I’m live. This distro fails when attempting to boot using F12 navigation on Dell (ubuntu 16 dual boot Win10) selecting the DVD drive; yet here we are running fine from DVD in the old girl HP! 
Great to see whilst using Tor browser on our site that pre installed NoScript has no issues.
Learned something whilst browsing with Tor and DuckDuckGo that a very popular UK store’s website flagged up a warning when I maximised the window: WARNING this website is recording your screen sizeto help identify or recognise you! - 
Perhaps start a fresh topic on Tails 4.2.2 when I get it on a USB.
Love everything about Tails so far. Love Tor 