So, I have the RTL8723BE problem. I tried to fix it. I downloaded rtlwifi and installed it (success), but at some point, I lost my wifi connection. Then, i got the "modprobe: ERROR: could not insert 'rtl8723be': Required key not available" so i followed this instructions. It all went well until i got to this part:
sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n rtl8723be)
which gave me this error
modinfo: ERROR: missing module or filename. Usage: scripts/sign-file [-dp] <hash algo> <key> <x509> <module> [<dest>] scripts/sign-file -s <hash algo> <x509> <module> [<dest>]
Because of that error I did not continue, because I imagine it's useless. What can I do?