uim-im-switcher-gtk: 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/uim-im-switcher-gtk - from package: uim-gtk2.0

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

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