bash
apt-get download linux-tools-5.4.0-65-generic
dpkg -i linux-tools-5.4.0-65-generic_5.4.0-65.73_arm64.deb
or
bash
ar x linux-tools-5.4.0-65-generic_5.4.0-65.73_arm64.deb
tar xf data.tar.xz
if dpkg is not installed
bash
apt-get download dpkg/focal-updates
ar x dpkg/focal-updates
tar -xvf data.tar.xz -C /
how to download all dependency of a package
bash
apt-get download $(apt-rdepends linux-tools-5.4.0-65-generic | grep -v "^ " | sort -u)