e2ls: command not found

Have You tried accessing the binary with the full path?

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/e2ls - from package: e2tools

You may install the required package with command apt-get install {package}
Error in other languages:
e2ls: bevel nie gevind nie
e2ls: comandă negăsită
e2ls: comando não encontrado
e2ls: commande introuvable
e2ls: command not found
e2ls: käsku ei ole
e2ls: không tìm thấy lệnh
e2ls: komanda nerasta
e2ls: Kommando nicht gefunden.
e2ls: kommandot finns inte
e2ls: komut yok
e2ls: nie znaleziono polecenia
e2ls: níor aimsíodh an t-ordú
e2ls: no se encontró la orden
e2ls: no s'ha trobat l'ordre
e2ls: opdracht niet gevonden
e2ls: parancs nem található
e2ls: perintah tidak ditemukan
e2ls: príkaz nenájdený
e2ls: příkaz nenalezen
e2ls: команда не найдена
e2ls: командата не е открита
e2ls: 命令找不到
e2ls: コマンドが見つかりません