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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