Vietnamese Input on KDE Ubuntu (fcitx5 + Unikey)

Avoid IBus on KDE — fcitx5 is the native choice.

Install

sudo apt install fcitx5 fcitx5-unikey fcitx5-config-qt
im-config -n fcitx5

Configure

fcitx5-config-qt

• If prompted to update/restart addons, do it and reopen
• Search viet → select Unikey → add it with the ← arrow
• Apply → OK

Reboot

reboot

Usage

• Ctrl+Space — toggle Vietnamese input
• Default mode: Telex (aa→â, ow→ơ, uw→ư, f→huyền, s→sắc, r→hỏi, x→ngã, j→nặng)
• Right-click tray icon to switch between Telex / VNI

Troubleshoot

pgrep -a fcitx5   # check it's running
im-config -m      # should show fcitx5