how to connect internet using sim7600 in ubuntu 18 server using modem manager or cellular connection or RNDIS or qmi mode?
Don’t know specifically for this one, but here you can find some clues.
This method no information regarding to connect to the modem manager (sim7600)
same sim7600 is connected to my ubunut18 desktop
but in rock pi ubuntu 18 server is not connecting even though i installed modem manager
There is no relationship with (x86) Ubuntu kernel which is why this does not work. On quick checkup https://techship.com/faq/how-to-integrate-simcom-sim7500-sim7600-series-linux-ndis-driver-without-rebuilding-kernel/ you need to enable certain features in kernel.
Use Armbian. All required features are already enabled.