$> ls -lah /etc/apache2/mods-available/ | egrep "security"
-rw-r--r-- 1 root root 551 Mar 24 22:43 security2.conf
-rw-r--r-- 1 root root 91 Sep 28 2017 security2.load
$> sudo apt update
$> sudo apt install libapache2-modsecurity
$> sudo a2enconf security
$> sudo a2enmod security2
nano /etc/apache2/conf-enabled/security.conf
# ServerTokens
# This directive configures what you return as the Server HTTP response
# Header. The default is 'Full' which sends information about the OS-Type
# and compiled in modules.
# Set to one of: Full | OS | Minimal | Minor | Major | Prod
# where Full conveys the most information, and Prod the least.
#ServerTokens Minimal
#ServerTokens OS
ServerTokens Full
Changing the server header dosen't work if ServerTokens is "Prod"
Explanation: https://mod-security-users.narkive.com/LppmHRtr/secserversignature-is-not-working#post4
$> sudo nano /etc/apache2/mods-enabled/security2.conf
SecRuleEngine on
ServerTokens Full
SecServerSignature "Anything_Yout_hearts_Desire"