希望我是在正确的地方。
我遵循这个指示：https://tecadmin.net/install-zabbix-on-ubuntu/
zabbix-release_4.2-1+bionic_all.deb我没有安装，而是下载了zabbix-release_4.4-1+bionic_all.deb文件。
通过安装和zabbix-server-mysql和zabbix-frontend-php，zabbix-agent出现以下错误输出：
ahmedsmaha@DarkStar:~$ sudo apt install zabbix-server-mysql zabbix-frontend-php zabbix-agent
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
zabbix-server-mysql : Depends: libmysqlclient20 (>= 5.7.11) but it is not installable
Recommends: snmpd but it is not going to be installed
E: Unable to correct problems, you have held broken packages.