Because emojis are not displaying in Chromium I had to install fonts-noto-color-emoji
via:
sudo apt reinstall fonts-noto-color-emoji
Then emojis work just fine.
But after restarting my machine emojis stop working again.
Is there something, that I have to configure to boot the package at startup? Or what is going wrong?
Here is a topic related to a bug that you described.
https://bugs.launchpad.net/ubuntu/+source/fonts-noto-color-emoji/+bug/1859926
I fixed it using denshigomi's suggestion:
I've just installed Ubuntu 20.04 and I no longer have the issue.