[SOLVED] install over existing Linux without losing /home on sdb1

I am planning on installing Ubuntu, or one of its forks like Pop!_OS, to replace my older Fedora 27. I have a SSD and a SATA drive. My /home is on the SATA drive.

After installing Ubuntu on my laptop I noticed that the default install is to dump everything onto the / partition.

My thought was to just unplug the SATA drive during the install, but them howto tell Ubuntu to not use the silly / for everything and than to mount and use the sdb1 for my /home?

Other option would be to leave both drives connected, but I do not want to lose any data on my /home disk. I am fully happy with losing everything on /

Code:$ df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 16G 0 16G 0% /dev
tmpfs tmpfs 16G 407M 16G 3% /dev/shm
tmpfs tmpfs 16G 1.9M 16G 1% /run
tmpfs tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/sda3 ext4 49G 25G 22G 54% /
tmpfs tmpfs 16G 28K 16G 1% /tmp
/dev/sda5 ext4 976M 190M 720M 21% /boot
/dev/sda2 vfat 200M 18M 182M 9% /boot/efi
/dev/sda6 ext4 163G 61M 154G 1% /stuff
/dev/sdb1 ext4 4.6T 3.0T 1.4T 69% /home
tmpfs tmpfs 3.2G 32K 3.2G 1% /run/user/1001
jackknife:/mnt/Exports/Exports nfs4 11T 8.0T 2.5T 77% /home/user/Jackknifethoughts, comments, feedback, advice?

Thank you in advance.