Emer Chen 陳東茂 says to Ubuntu 台灣社群
TheHellstorm commented on 1 Jan 2015 Telegram on Linux does not support input methods for East Asian languages. For example, fcitx does not work. In other Linux programs pressing (for example) Ctrl+Space activates the input method. In Telegram, nothing happens. Also, you cannot select the input method with right clicking in the text box, as it would work in other programs. 大意是 #telegram 在 #linux 中無法啟動 #輸入法 ,解決方法是安裝 fcitx-frontend-qt5,重新登出登入後即可使用。