I installed um 16.04 to 2nd drive. I still wanted itto boot to my 18.04 installation. Why um assumes everyone wants to boot to a new installation is a mystery. I then used grub customizer to have it boot to 18.04. When i booted it went to the dreaded black screen. Grub repair did nt help. I used gparted and formated the 2nd drive. I am attempting to reinstall over orig 18.04 knowing it will not overwrite it. It has been trying for over 15 mins and seems to be stuck. It need help.
@fixit7, on any new Ubuntu installation, not just Ubuntu MATE, grub will take over the boot menu. Note that while in grub, one can edit individual grub entries for that session by pressing the 'e' key. And I must note that Grub Customizer is not without its' flaws.
You might try deleting 'quiet splash' and adding 'nomodeset' to the end of the line that begins with something like "linux /boot/vmlinuz-4.15.0-45-generic". That could allow you to boot into your 18.04 install although it sounds like you are reinstalling without a format. I thought you were a user of Clonezilla and if it became necessary, you would restore a previous image. No?
Good luck Andy.
I did use clonezilla. That is what is strange. I have never had a restored image fail to boot.
When one makes the image, there is the option to have the image include a boot image (its' grub) also. Perhaps this might help - https://unix.stackexchange.com/questions/367185/clonezilla-clone-wont-boot-without-reinstalling-grub2
You probably have to mess with grub a bit.
Did you try the Boot Repair disk?
Yes. I have 18.04 sucessfully reinstalled.
Now I can not get my Canon MG 2220 printer to work.
I installed the drivers.
CUPS does not see the printer ?
I thought under System / Hardware there was a printer icon?