How to make #ubuntu folder for #chroot
https://en.wikipedia.org/wiki/Chroot
wget https://cdimage.ubuntu.com/ubuntu-base/releases/25.10/release/ubuntu-base-25.10-base-amd64.tar.gz
# Only 34 MB
wget https://cdimage.ubuntu.com/ubuntu-base/releases/25.10/release/SHA256SUMS
sha256sum -c SHA256SUMS 2>/dev/null
mkdir ubuntu-base
tar -xzf ubuntu-base-25.10-base-amd64.tar.gz -C ubuntu-base
cd ubuntu-base/
cp /etc/resolv.conf etc/resolv.conf
Create file inside:
mount --bind /dev dev
mount --bind /proc proc
mount --bind /sys sys
mount --bind /run run
chroot . /bin/bash
and run from root (because requires CAP_SYS_CHROOT)
