DIY install debian on Oracle Cloud Infrastructure ( Free Tier ) - ARM64

reinstall_VPS_from_inside.txt

sudo -i

sudo apt update && sudo apt dist-upgrade -y && sudo apt install lsof && sudo reboot

# ssh back in
sudo -i

snap remove --purge  oracle-cloud-agent && sudo snap remove --purge core18
apt purge -y $(dpkg-query -Wf '${Package}\n' | grep header)  $(apt list --installed | grep -oP "^linux.*\d\d\d\d-oracle" | grep -v "$(uname -r)") linux-modules-extra-$(uname -r) lxc* lxd* vim* && sudo apt -y autoremove && sudo apt -y autoclean && apt -y clean  
rm -rf /var/log/* /var/lib/apt/lists/*

cd /
mount -t tmpfs -o size=1700m tmpfs mnt
tar --one-file-system -c . | tar -C /mnt -x
mount --make-private -o remount,rw /
mount --move dev mnt/dev
mount --move proc mnt/proc
mount --move run mnt/run
mount --move sys mnt/sys
sed -i '/^[^#]/d;' mnt/etc/fstab
echo 'tmpfs / tmpfs defaults 0 0' >> mnt/etc/fstab
cd mnt
mkdir old_root
mount --make-private /
unshare -m
pivot_root . old_root

/usr/sbin/sshd -D -p 1022 &

iptables -I INPUT -p tcp -m state --state NEW -m tcp --dport 1022 -j ACCEPT

# reconnect on port 1022: I kept the old putty session (on port 22) open and it didn't disconnect

pkill agetty
pkill dbus-daemon
pkill atd
pkill iscsid
pkill rpcbind
pkill unattended-upgrades
kill 1 

umount -l /dev/sda1
# rsync your generated arm tar
# rsync -arvz -e 'ssh -p 1022' ~/Downloads/oracle.tar.gz ubuntu@x.x.x.x:/home/ubuntu
tar xzOf /home/ubuntu/oracle.tar.gz | dd of=/dev/sda bs=1M

sync

# Now go force reboot the instance (dont use reboot only, or your waiting 15 minutes)