From my old HD (Ubuntu 16.04) I copied ~/.thunderbird and other programs to the new disk with Ubuntu 18.04 installed.
All went good.
I tried to install Opera. The installation was unsuccessful, a window asking something was held.
After that Thunderbird Local Folders -> Inbox (only) was invaded by large icons like this screenshot

Flowers, plants, trucks and others.
I restarted but those images are still there.
Opera was successfully installed.
What can I do to remove them?
3 Answers
This fixed it for me:
sudo apt-get install fonts-symbola
but turns the icons b/w!
From https://ubuntu-mate.community/t/thunderbird-with-huge-icons-emoticons-mate-18-04/16249/23
Here's a way of getting colored icons:
sudo apt-add-repository ppa:eosrei/fonts
sudo apt-get update
sudo apt-get install fonts-twemoji-svginot
I did not have to uninstall fonts-symbola for this to work but I don't know how Thunderbird decides which to use.
New font info from http://www.omgubuntu.co.uk/2016/08/enable-color-emoji-linux-google-chrome-noto
While not a long-term solution (but should work until the fix for the bug is deployed), you can install the EditEmailSubject add-on for Thunderbird. It will allow you to delete offending characters from message subjects.
I find the add-on useful generally so this works for me.
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To fix this I downloaded the
NotoEmoji-Regular.ttf
from here: https://github.com/googlei18n/noto-emoji/tree/master/fonts
and copied it to
/usr/share/fonts/truetype/noto
(sudo was required)
then restarted Thunderbird and everything was fine.
References: https://support.mozilla.org/en-US/questions/1178430
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