you mean the SSD has umbrel installed and you want to run it within a preexisting ubuntu install?
Discussion
No. He's installed Umbrel on his Ubuntu machine.
He wants to install the Bitcoin app, but there is no option to select where the timechain should go.
I've done this before and it just fills up the drive umbrel is installed on.
There must be a way in the config to point to a mounted drive for this.
Other option is to reinstall Umbrel to fun off the SSD I guess.
check where umbrel is downloading the blockchain (IIRC /mnt/hdd) and just mount the drive there
echo '/dev/[path-to-the-disk] /mnt/hdd ext4 defaults 0 0' >> /etc/fstab
and reboot the system
you'll need to replace [path-to-the-disk] with the actual path, like /dev/sdb1 or whatever
and obv /mnt/hdd with the place where umbrel writes data