Codeview
VI
Linux Input
ibus • fcitx5 • unikey
LinuxUbuntu

Ubuntu Vietnamese input: ibus-bamboo or fcitx5-unikey?

Compare ibus-bamboo and fcitx5-unikey on Ubuntu, including GNOME, Electron apps, predict bar issues, and stable typing choices.

8 min read15/06/2026
Table of contents

Which one should you use on Ubuntu: ibus-bamboo or fcitx5-unikey?

If you are on Ubuntu and just want the least painful answer to "which Vietnamese input method should I install", the choice mostly depends on your GNOME version and the apps you type in every day. ibus-bamboo fits Ubuntu 24.04 + GNOME 46 well. fcitx5-unikey is usually the safer choice on Ubuntu 24.10+, KDE, or Electron-heavy workflows like VS Code, Slack, and Discord.

This guide starts with that decision, then covers installation and the most common failure modes.

Quick Comparison

ibus-bamboo fcitx5-unikey
Framework IBus Fcitx5
GNOME Good (Ubuntu 24.04) Needs extra setup
KDE Plasma Okay Better
Electron apps Occasional issues Generally more stable
Predict bar (GNOME 47+) Buggy Not affected
Setup complexity Simple More involved

Choose ibus-bamboo if: You're on Ubuntu 24.04 with GNOME 46.

Choose fcitx5-unikey if: You're on Ubuntu 24.10+, KDE, or frequently type in Electron apps (VS Code, Slack, Discord).

Installing ibus-bamboo

Requirements

  • Ubuntu 20.04 or later
  • GNOME desktop (recommended with Ubuntu 24.04)

Step 1: Add the PPA and install

sudo add-apt-repository ppa:bamboo-engine/ibus-bamboo
sudo apt update
sudo apt install ibus-bamboo -y

Step 2: Set as default engine

env DCONF_PROFILE=ibus dconf write /desktop/ibus/general/preload-engines "['BambooUs', 'Bamboo']"
ibus restart

Step 3: Add to Settings

  1. Go to Settings → Keyboard → Input Sources
  2. Click + → select Other → search for Vietnamese (Bamboo)
  3. Add it to your list
  4. Use Super + Space to switch input methods

Step 4: Choose your input style

Right-click the keyboard icon in the taskbar → Preferences:

  • Input method: Telex or VNI
  • Output charset: Unicode (default)
  • Disable Show candidate window if a predict bar keeps appearing

Test it

Open a text editor and type: viet nam (Telex) or viet6 nam1 (VNI) — you should get việt nam.

Installing fcitx5-unikey

Requirements

  • Ubuntu 22.04 or later
  • Works well on both GNOME and KDE

Step 1: Install fcitx5 and unikey

sudo apt update
sudo apt install fcitx5 fcitx5-unikey -y

Step 2: Set fcitx5 as the default input method

im-config -n fcitx5

Or open Input Method Configuration from the app menu and select fcitx5.

Step 3: Add environment variables

Open /etc/environment:

sudo nano /etc/environment

Add these lines at the end:

GTK_IM_MODULE=fcitx
QT_IM_MODULE=fcitx
XMODIFIERS=@im=fcitx

Save with Ctrl + O, Enter, Ctrl + X.

Step 4: Add Unikey to fcitx5

  1. Log out and log back in to load the environment variables
  2. Open Fcitx5 Configuration from the app menu
  3. Go to the Input Method tab → click +
  4. Uncheck Only Show Current Language → search for Unikey
  5. Add it and click Apply

Step 5: Configure Unikey

In Fcitx5 Configuration → Input Method → Unikey → Settings:

  • Input method: Telex or VNI
  • Output charset: Unicode
  • Check Process W at word begin if using Telex (so w types ư)

Step 6: Set the toggle shortcut

Under Global Options → Trigger Input Method: defaults to Ctrl + Space. You can change it to Super + Space to match GNOME's convention.

Test it

Restart fcitx5:

fcitx5 &

Open a text editor and try typing Vietnamese.

Troubleshooting Common Issues

ibus-bamboo: Predict bar appears while typing

This happens on GNOME 47+ (Ubuntu 24.10 and later). Two options:

Option 1: Disable it in ibus-bamboo settings:

gsettings set org.freedesktop.ibus.engine.bamboo show-preedit-text false

Option 2: Switch to fcitx5-unikey (recommended if you're on Ubuntu 24.10+).

fcitx5: Can't type in some apps

Check whether the environment variables are actually loaded:

echo $GTK_IM_MODULE
echo $QT_IM_MODULE

If these return empty, the variables haven't been applied. Log out and back in, or reboot.

fcitx5: Doesn't start with the system

Add fcitx5 to autostart:

cp /usr/share/applications/org.fcitx.Fcitx5.desktop ~/.config/autostart/

Both: Can't type Vietnamese in VS Code

VS Code (Electron) sometimes doesn't pick up input methods properly. Add these flags to ~/.config/code-flags.conf:

--enable-features=UseOzonePlatform
--ozone-platform=wayland

Or add them directly to the VS Code .desktop launcher file.

Uninstalling if You Want to Switch

Remove ibus-bamboo

sudo apt remove ibus-bamboo -y
sudo add-apt-repository --remove ppa:bamboo-engine/ibus-bamboo
sudo apt autoremove -y

Remove fcitx5

sudo apt remove fcitx5 fcitx5-unikey -y
sudo apt autoremove -y
im-config -n ibus

Also remove the lines you added to /etc/environment, then reboot.

Summary

Neither option is universally better — it depends on your setup:

  • Ubuntu 24.04 + GNOME 46 → use ibus-bamboo — quick to install, works out of the box
  • Ubuntu 24.10+ or KDE → use fcitx5-unikey — avoids the GNOME 47+ predict bar bug
  • Heavy VS Code or Electron app usage → fcitx5-unikey is more reliable

If you're on Ubuntu 24.04 and unsure where to start, go with ibus-bamboo. It's simpler to set up and works well on that version without any extra tweaking.

Read next:

Back to posts list

Table of contents