Dear everyone.

I download ubuntu-20.04-desktop-amd64.iso,
I make USB boot disk for ubuntu-20.04 install,
I boot up USB then I install ubuntu-20.04 successfully.

Before today, I fail to install ubuntu-20.04,
installer ask me that disk setup step. 
because I use grub iso boot from /dev/sdb iso file.

The installer has detected that the following disks have mounted
partitions:

/dev/sdb/

Do you want the installer to try and unmount the partitions on these disks 
before continuing? If you leave them mounted, you will not be able to create, 
delete, or resize partitions on these disks, but you may be able to install 
to existing partitions there.

I answer NO, ubuntu-18.04 can install /dev/sda1 from /dev/sdb1 iso.
but I think ubuntu-20.04, this step may be wrong.

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https://bugs.launchpad.net/bugs/1872366

Title:
  ubuntu forcal-desktop-amd64 could not install to geforce 8600GTI PC

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