labrea: 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/sbin/labrea - from package: labrea

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

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