tslearn: 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/tslearn - from package: gcin

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

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