On your current installed debian x64 installation:
sudo apt install debootstrap sudo debootstrap stable chroottarget sudo tar -cvzf chroot.tar.gz chroottarget
Save the chroot.tar.gz
The above creates a debian chroot. Here’s how to make an Ubuntu one. jammy is currently the latest LTS:
debootstrap jammy chroottarget/ http://archive.ubuntu.com/ubuntu/
If you need to create a chroot for a different architecture, eg armhf, the second command would be:
sudo debootstrap --foreign --arch armhf stable chroottarget