How do I use this to make the daemon for Ubuntu?
You don't. this thread is specifically about cross compiling wallets for windows, using linux as your compile OS.
Great tutorial. It works perfectly. Thank you very much.
I have one question. You stated that some altcoins need QT4 instead of QT5. Do I have to choose just one or the other, or can I install both? Will any problems occur if both are installed?
Thanks.
It is possible to have both qt4 and qt5 available for cross compiling at the same time. I personally have chosen to NOT build any qt4 wallet anymore and instead update the wallet's source to support a qt5 build. This, however is a time consuming task so it may not be worth it for you.