The process of system upgrade is very easy and was already described here. This is a really great guide. I just want to add few comments, that affected my installation.
The main actions to perform to install latest version of Raspbian are:
Go to raspberrypi.org and check the latest OS codename.
Verify, if this version is not already installed on the Raspberry using cat /etc/os-release command.
$ cat /etc/os-release PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)" NAME="Raspbian GNU/Linux" VERSION_ID="9" VERSION="9 (stretch)" VERSION_CODENAME=stretch ID=raspbian ID_LIKE=debian HOME_URL="http://www.
Read more →