ubuntu package management question

[Robert Heller]

If one wants to install some program or library and knows the name of the 
program or library how does one find out what the *package name* is?  Is there 
no utility like 'yum search' (available on RedHat flavored systems)?

Specificly, I need qmake for QT5 installed on a Ubuntu 18.04 system.  What 
package do I install?  dpkg-query is no help.  Or must I search through the 
_Package files in /var/lib/apt/lists/?  Is there no better way? Has noone 
created a utility for this?

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