In August 2018 I allowed the upgrade from 16.04 to 18.04 take place on my computer. All appeared to work well until I logged out and tried to log back into my system. I poked around attempting to find answers to what I felt were reasonable questions. I ended up creating a Live CD for Ubuntu 18.04LTS Desktop for reinstalling the 18.04LTS system. I was following instructions found at the https://www.linuxtechi.com/ubuntu-18-04-lts-desktop-installation-guide-screenshots/ website. I reached Step 6 Selecting the appropriate installation type and drew a blank. The hard drive on which I had 16.04LTS installed is a password protected hard drive. When I booted the Live CD I was able to access the drive by entering the password and look at all my files. I could see the partitions to be Ext3/Ext4. However, when I chose Something Else at Step 6 of the Installation and I wanted to proceed without formatting since it was already formatted the Installation process could not see the partitions because the hard drive is password protected. There is no option given to enter the password and then allow the Installation to see the existing partitions. It simply believes there are no partitions. The only option the Installation gives is to repartition the already partitioned hard drive. If I select to partition the hard drive I will be asked to please enter the password (for the hard drive) and then it will proceed to overwrite the existing partitions. Even though I have backed up as much of the content using Live CD, I would rather not risk loosing all my files if that can be avoided.
How do I get the 18.04LTS Desktop Installation process to force the hard drive to be accessed (requiring the password) BEFORE partitioning is checked on my password protected hard drive?