lxc-console: 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-console - from package: lxc

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

On Debian possible default full paths are:

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

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

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