Upgrading a Samba domain controller from Debian9 Stretch to Debian10 Buster

Install Debian10 (physical or virtual machine) in a minimal way without GUI and only with SSH service, following this documentation.

Attention

If you encounter a problem when updating the repository and if you get the errors gpg: no valid OpenPGP data found or wget: unable to resolve host address "mydomain.lan", you will need to check your /etc/resolv.conf file and then add the following lines at the end of /root/.bashrc:

export http_proxy="http://proxy:3128";
export https_proxy="http://proxy:3128";

Update the TIS Samba repositories:

wget -O - http://samba.tranquil.it/tissamba-pubkey.gpg  | apt-key add
echo "deb http://samba.tranquil.it/debian/samba-4.11 buster main" > /etc/apt/sources.list.d/tissamba.list

Check the Debian source file /etc/apt/sources.list:

deb http://ftp.fr.debian.org/debian/ buster main contrib non-free
deb-src http://ftp.fr.debian.org/debian/ buster main contrib non-free

deb http://security.debian.org/debian-security buster/updates main contrib non-free
deb-src http://security.debian.org/debian-security buster/updates main contrib non-free

deb http://ftp.fr.debian.org/debian/ buster-updates main contrib non-free
deb-src http://ftp.fr.debian.org/debian/ buster-updates main contrib non-free

Check /etc/apt/sources.list.d/ then select tissamba.list and change the version of Samba if necessary:
```
deb http://mydomain.lan/debian/samba-4.11 buster main
```

Update the host:

apt-get update
apt-get upgrade
apt-get dist-upgrade

Restart the host:
```
reboot
```
Check the version of the Samba server:
```
samba-tool --version
```