My 10 year old desktop computer failed, so I obtained a refurbished Dell Optiplex 9020, installed Ubuntu 19.10 in parallel with ******* X. When I booted it up I was, of course, informed that there were updates so I permitted the application of the updates and restarted the computer. It did not restart. I am sitting looking at a plain purple screen. I looked at the debug kernel page but I do not see any of the relevant options in the grub script when I follow the instructions. When I try to edit the grub menu the text is only displayed for a few second before the screen goes black, so I couldn't edit it even if I could see the options I am instructed to modify. Furthermore prior to applying the updates the system always booted to the grub menu because that is only reasonable to permit me to choose between Ubuntu 19.10 and ******* X each time. After the upgrades I must hold down the right shift to see the grub menu. Could someone please direct me to current documentation of how to resolve this problem?
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