I have been tirelessly trying to install Ubuntu-18.04 since the last 2 days, but every attempt turned out to be negative. Apart from other GUI based problems, which I am reporting here.
When mounting the ISO using the inbuilt Disk Image Mounter utility, and attempting the GUI base upgrade method (from within Ubuntu-16.04.1).
I get a pop-up saying
Oops! There was a problem running this software. Unable to locate the program.
When mounting the ISO and attempting an upgrade through the terminal, the gksu sh /cdrom/cdromupgrade command leads to a blurred screen prompting for the password and then does nothing. Replacing gksu with sudo returns cdromupgrade command not found.
When booting from a live flash drive (created from the same ISO), the installation freezes at the network page after I enter the password for my wifi. When using a wired connection, the network page does not appear. The installation freezes at the page where it asks for Normal or Minimal installation. It even has options for Install Updates and install Third-Party Drivers etc (the 3rd page of the installation). I have tried different combinations of options, but the installation never proceeds further. Sometimes, it even freezes at the keyboard selection page (the 2nd page of the setup).
I have already verified the integrity of the downloaded ISO through a checksum verification. It is perfectly OK.
Current OS: Ubuntu-16.04.1 (latest kernel, as per apt-get)
Machine : MSI GV62 7RD
I own MSI GS73VR 6RF. Even I had the same problem. But I was able to fix it by applying nomodeset during the boot from the liveCD. Complete explanation is given in
How do I set 'nomodeset' after I've already installed Ubuntu?
Try from the second step.( Step - press e)