Can you try installing the en_GB.utf8 locale? For unicode support, the default locale is set to en_US.utf8 unless you define the LC_ALL to be some other locale with UTF8 support.
On Debian/Ubuntu distributions that locale seems to only work if en_GB.utf8 is also available.
You can check what locales are available by typing
locale -aIf en_US.utf-8 and en_GB.utf-8 are not available, you can install the locales with the instructions here
https://wiki.debian.org/Localehttps://help.ubuntu.com/community/Locale#A.28Re-.29Generating_localesBasically, if those two locales are not available, you can run
sudo locale-gen en_US.utf8
sudo locale-gen en_GB.utf8
sudo update-locale
The last line may not be needed.
Let me know if it's still not working.