lxc-wait: 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 CentOS possible default full paths are:

/usr/bin/lxc-wait - from package: lxc

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/lxc-wait - from package: lxc

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

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