I come from a RHEL/Fedora admin background. Finding equivalent admin commands or configuration steps on Ubuntu can be tricky for us seasoned Red Hat guys. One article that I’ve found extremely helpful and return to often is: “Switching To Ubuntu From Red Hat Enterprise Linux And Fedora” (help.ubuntu.com). It lists a lot of common RHEL admin commands and the corresponding Ubuntu/Debian equivalent.
I hope you find it helpful too!