package-installs: 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/share/diskimage-builder/elements/package-installs/bin/package-installs - from package: python-diskimage-builder

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

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