sudo mkdir /offline
sudo cp -r /var/cache/apt/archives /offline
sudo chmod 777 -R /offline/
sudo dpkg-scanpackages /offline/ /dev/null |gzip >/offline/Packages.gz
sudo cp /offline/Packages.gz /offline/archives/Packages.gz
tar zcvf /offline.tar.gz /offline/

mv /etc/apt/sources.list /etc/apt/sources.listback
echo "deb file:///offline archives/" > /etc/apt/sources.list
apt-get update

Get:1 file:/offline archives/ InRelease
Ign:1 file:/offline archives/ InRelease
Get:2 file:/offline archives/ Release
Err:2 file:/offline archives/ Release
File not found - /offline/archives/Release(2:No such file or directory)