I upgraded, but ran into a problem updating packages. While downloading the upgrades for LibreOffice the connection was lost. It took several attempts before I successfully finished the upgrades. However, I could not open a GUI because the firmware could not detected. I eventually gave up and reinstalled 6.4. Now the disc drive is working again.
I am inclined to believe that I missed some small thing I was supposed to do during the last upgrade and it snowballed into a problem. The bottom line is the issue is solved in respect to the problem being gone. As for the cause, I do not want to think too much about it, because it would give me headache.
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