RTL8821CE DKMS driver will not work with secure boot enabled
FIXED! I went to this page on Github (https://github.com/tomaspinho/rtl8821ce) where I'd installed the drivers from previously (before I reset the installation). If you scroll down you can see they mention that you should blacklist rtw88_8821ce. I tried using this before but it didn't make a difference because apparently I was blacklisting the wrong driver. When I ran "sudo lshw -C network" and checked under my Wi-Fi chip, it showed it was using "rtw_8821ce" as its driver. So what I did was I blacklisted rtw_8821ce instead in the file "/etc/modprobe.d/blacklist.conf". Following this, I manually deleted all the other drivers I had tried to install and then clean installed rtl8821ce. After the install, just reboot with Secure Boot enabled and now everything works perfectly.