slic3r: 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/slic3r - from package: slic3r

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

Error in other languages:
slic3r: bevel nie gevind nie
slic3r: comandă negăsită
slic3r: comando não encontrado
slic3r: commande introuvable
slic3r: command not found
slic3r: käsku ei ole
slic3r: không tìm thấy lệnh
slic3r: komanda nerasta
slic3r: Kommando nicht gefunden.
slic3r: kommandot finns inte
slic3r: komut yok
slic3r: nie znaleziono polecenia
slic3r: níor aimsíodh an t-ordú
slic3r: no se encontró la orden
slic3r: no s'ha trobat l'ordre
slic3r: opdracht niet gevonden
slic3r: parancs nem található
slic3r: perintah tidak ditemukan
slic3r: príkaz nenájdený
slic3r: příkaz nenalezen
slic3r: команда не найдена
slic3r: командата не е открита
slic3r: 命令找不到
slic3r: コマンドが見つかりません