Gnome 3.22 changes the default backend to Wayland but fcitx does not fully support wayland yet. Switch to "Gnome on xorg" if fcitx-sogou does not work.
If sogou is not working but it works before, try rm -rf ~/.sogouinput && cd ~/.config && rm -rf fcitx/ SogouPY SogouPY.users sogou-qimpanel and then relogin the desktop environment.
open file /usr/share/fcitx-sogoupinyin/SogouInput/sgim_charvalid.bin failed.
open file /home/kerwin/.config/SogouPY/punctures.ini failed.
open file /home/kerwin/.config/SogouPY/punctures.ini failed.
open file /home/kerwin/.config/SogouPY/sgim_usr_v3_ext.bin failed.
open file /home/kerwin/.config/SogouPY/sgim_phrases.bin failed.
open file /home/kerwin/.config/SogouPY/sgim_privilege.bin failed.
dpkg: 未找到命令