Comment 6 for bug 1755831

I found the same issue in Ubuntu Budgie 18.04 (official release). Below is what I did:

- Language Support > Added Chinese Simplified, Chinese Traditional, and Japanese.
- Input Method > set to ibus (default)
- Package installed: ibus-pinyin, ibus-mozc
- Region & Language > added the above two input methods
- Rebooted the system but the language/input selector icon doesn't appear in the system tray when I try to switch the input method.
- Adding the "Keyboard Layout" and "Keyboard AutoSwitch" applets doesn't help either.

I recall that this was working properly in a previous version (17.04 or 17.10), so this would likely be a regression.
Also, not sure if I remember this correctly, but in the previous version it was working under the "fcitx" input method. The "fcitx" option is missing in 18.04 for some reason.

Hope this helps.