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Debian GNU/Linux 9 (stretch) 64-bit

I have a problem I'm trying to report but the report bug has directed me
to you.  I don't know what package I'm reporting on.  Everything I've
tried entering has been rejected.  I used the internet version to
install Debian on my computer. I wanted to install Debian as a 2nd OS on
my computer along with Ubuntu.  Unfortunately for me, I was half asleep
while doing the install and guessing at the choices being offered. The
problem I encountered was some of the instructions/choices were off the
left hand side of the monitor and not visible.  I had to guess at what I
was doing.  One of the consequences is the install overwrote my Ubuntu
OS and I lost everything.  The other consequence is now I'm unable to
boot from my dvd drive.  It seems that no matter what I try regarding
changes to the BIOS before booting to try and boot from the dvd drive,
the Debian OS overwrites my changes and forces booting from the Hard
Drive.  I need help.