uec-run-instances: 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/uec-run-instances - from package: cloud-utils

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

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