I am totally new to the forum, linux and Rasperry Pi, which is not the best baseline, I know. I bought some Raspberry's (4B) and made two bootable SD cards. I don't like the interface of Raspbian, so I installed Ubuntu and Ubuntu Mate. The problem now is that they won't connect with my TV via HDMI and are not visible in the network via LAN. So I don't see any possibility to communicate with the Pi. Have I just forgotten to setup something or is there an easy solution for this problem? (To flash the images I used Win32 Disk imager for the Ubuntu.iso and Etcher for the Ubuntu Mate.img)
I sincerely hope that there is someone who can help me.