Debian 9 stable == > Debian 10 stable installation
Debian 9 stable == > Debian 10 stable installation
Steps were identical for when I did the Debian 8 stable == > Debian 9 stable installation.
Only differences were that sudo was already installed by default, so I did not have to have aptitude install it.
EDIT 2019-10-19
For my current Debian PC, which is a vintage Gateway laptop. I did have to update sources.list to include nonfree, as the laptop needed the i915 firmware to be installed.
Then had to do
robert@pip2:/tmp$ sudo aptitude update robert@pip2:/tmp$ sudo aptitude safe-upgrade robert@pip2:/tmp$ sudo aptitude install firmware-misc-nonfree
Then just to be safe, sync'd and rebooted
robert@pip2:/tmp$ sync robert@pip2:/tmp$ sudo /sbin/shutdown -h now