partclone.ext4: 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

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/partclone.ext4 - from package: partclone

You may install the required package with command apt-get install {package}
Error in other languages:
partclone.ext4: bevel nie gevind nie
partclone.ext4: comandă negăsită
partclone.ext4: comando não encontrado
partclone.ext4: commande introuvable
partclone.ext4: command not found
partclone.ext4: käsku ei ole
partclone.ext4: không tìm thấy lệnh
partclone.ext4: komanda nerasta
partclone.ext4: Kommando nicht gefunden.
partclone.ext4: kommandot finns inte
partclone.ext4: komut yok
partclone.ext4: nie znaleziono polecenia
partclone.ext4: níor aimsíodh an t-ordú
partclone.ext4: no se encontró la orden
partclone.ext4: no s'ha trobat l'ordre
partclone.ext4: opdracht niet gevonden
partclone.ext4: parancs nem található
partclone.ext4: perintah tidak ditemukan
partclone.ext4: príkaz nenájdený
partclone.ext4: příkaz nenalezen
partclone.ext4: команда не найдена
partclone.ext4: командата не е открита
partclone.ext4: 命令找不到
partclone.ext4: コマンドが見つかりません