GNOME Bugzilla – Bug 788068
Drop Character Map documentation
Last modified: 2017-10-30 18:44:12 UTC
GNOME Characters replaced Character Map in GNOME 3.20. I believe most distros now ship Characters instead of Character Map by default. (Ubuntu 17.10 is an exception but maybe that will happen for 18.04 LTS.) https://help.gnome.org/users/gnome-help/stable/tips-specialchars.html I suggest dropping Character Map from the main GNOME user documentation. Otherwise, you'll need to help the user install it.
Thanks for taking the time to report this. Dropped in 777d817314a9a6581d1a815fa239f40d23e6dea1 and d4abfc32f1eed5ea18cac40ce0ee0f902a06504f.