im-launch: 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/im-launch - from package: im-config

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

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