aseprite: 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/aseprite - from package: aseprite

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

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