Solved! Rock pi 4 a - ubuntu - unable to install apache2

Operating system distributions Debian/Ubuntu
4

Like you I also run Rock Pi 4A’s as I use them as mini servers.
To answer your points.

  1. No Ubuntu 18.04.2 is a stable arm64 OS.
  2. You need a heatsink or the Official Rock Pi Heatsink
    to find the temp of your cpu run $ paste <(cat /sys/class/thermal/thermal_zone*/type) <(cat /sys/class/thermal/thermal_zone*/temp) | column -s $’\t’ -t | sed ‘s/(.)…$/.\1°C/’

mine run at 28 - 32c with the offical heatsink

  1. Bigger more expensive does not mean better. Sandisk & some Toshiba sd designed to work in digital cameras (M203 & ADP-H502 both come with a 5 year warranty).

  2. stabalise your cpu temprature.

  3. boot from sd.

  4. run sudo -i

  5. apt update

  6. sudo apt install openssh-server -y

  7. unminimize

  8. check ip addr

  9. reboot

  10. login through a terminal or putty.

I hope this helps clarify’s where your isue maybe?.