ibus: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/ibus - from package: ibus

You may install the required package with command apt-get install {package}

Error in other languages:
ibus: bevel nie gevind nie
ibus: comandă negăsită
ibus: comando não encontrado
ibus: commande introuvable
ibus: command not found
ibus: käsku ei ole
ibus: không tìm thấy lệnh
ibus: komanda nerasta
ibus: Kommando nicht gefunden.
ibus: kommandot finns inte
ibus: komut yok
ibus: nie znaleziono polecenia
ibus: níor aimsíodh an t-ordú
ibus: no se encontró la orden
ibus: no s'ha trobat l'ordre
ibus: opdracht niet gevonden
ibus: parancs nem található
ibus: perintah tidak ditemukan
ibus: príkaz nenájdený
ibus: příkaz nenalezen
ibus: команда не найдена
ibus: командата не е открита
ibus: 命令找不到
ibus: コマンドが見つかりません