I experienced similar problems with my second box. I never fully resolved the problem other than attributing the events to a flaky CD drive. The CD reads fine on my other box and I installed Slackware there. I've tried other CDs in that drive with similar results. Time for a new drive I guess.
In the end I resorted to tolerating the CD drive just long enough to get the basic packages installed. Thereafter I installed the remaining packages manually using installpkg
. Takes longer, for sure, but not that difficult.
Currently I am trying to reinstall Slack on that second box using the ISO image
and floppies. The floppies all work fine, but I have had no success getting setup
to work with the ISO image.
I hope this helps.