So I'm a Linux user, right? I've reinstalled Gentoo Linux over the past few months, and one thing in the setup struck out to me: Why the heck is there password quality control enabled by default? Well, there's a service enabled by default, called passwdqc. If you need insecure passwords, I'd recommend to loosen its' configuration to allow for them.
The location of it is /etc/security/passwdqc.conf (atleast on Gentoo).
online manual for passwdqc.conf
If you're lazy or just want a setup that works, here's the least restrictive configuration:
min=0,0,0,0,0 max=72 passphrase=3 match=0 similar=permit random=47 enforce=none retry=3