update-otags: command not found

Have You tried accessing the binary with the full path?

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/sbin/update-otags - from package: otags

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